[fenix] For https://github.com/mozilla-mobile/fenix/issues/23919 - Replace tabRing attribute with accent

app/src/main/res/drawable/session_border.xml

@@ -5,5 +5,5 @@
 
 <shape xmlns:android="http://schemas.android.com/apk/res/android">
     <corners android:radius="@dimen/tab_corner_radius"/>
-    <stroke android:width="@dimen/tab_border_width" android:color="?tabRing"/>
+    <stroke android:width="@dimen/tab_border_width" android:color="?accent"/>
 </shape>

app/src/main/res/values-night/colors.xml

@@ -127,7 +127,6 @@
     <color name="inset_normal_theme">@color/photonDarkGrey50</color>
     <color name="accent_normal_theme">@color/photonViolet50</color>
     <color name="accent_high_contrast_normal_theme">@color/photonViolet40</color>
-    <color name="tab_ring_normal_theme">@color/accent_normal_theme</color>
     <color name="neutral_normal_theme">@color/photonGrey20</color>
     <color name="neutral_faded_normal_theme">#1FFBFBFE</color>
     <color name="toggle_off_knob_normal_theme">@color/toggle_off_knob_dark_theme</color>

app/src/main/res/values/attrs.xml

@@ -17,7 +17,6 @@
     <attr name="accentBright" format="reference" />
     <attr name="accentHighContrast" format="reference" />
     <attr name="accentUsedOnDarkBackground" format="reference" />
-    <attr name="tabRing" format="reference" />
     <attr name="snackbar" format="reference" />
     <attr name="foundation" format="reference" />
     <attr name="above" format="reference" />

app/src/main/res/values/colors.xml

@@ -259,7 +259,6 @@
     <color name="foundation_private_theme">#261E4B</color>
     <color name="accent_private_theme">@color/photonViolet50</color>
     <color name="accent_high_contrast_private_theme">#AA71FF</color>
-    <color name="tab_ring_private_theme">#F565FF</color>
     <color name="neutral_private_theme">@color/photonGrey20</color>
     <color name="neutral_faded_private_theme">#1FFBFBFE</color>
     <color name="scrimStart_private_theme">@color/photonInk80A96</color>
@@ -283,7 +282,6 @@
     <color name="inset_normal_theme">@color/photonLightGrey30</color>
     <color name="accent_normal_theme">@color/photonInk20</color>
     <color name="accent_high_contrast_normal_theme">@color/photonInk20</color>
-    <color name="tab_ring_normal_theme">@color/photonInk20</color>
     <color name="neutral_normal_theme">@color/photonGrey30</color>
     <color name="neutral_faded_normal_theme">@color/photonGrey20</color>
     <color name="fill_link_from_clipboard_normal_theme">@color/photonInk20</color>

app/src/main/res/values/styles.xml

@@ -56,7 +56,6 @@
         <item name="foundation">@color/fx_mobile_layer_color_1</item>
         <item name="above">@color/fx_mobile_layer_color_2</item>
         <item name="inset">@color/inset_normal_theme</item>
-        <item name="tabRing">@color/tab_ring_normal_theme</item>
         <item name="neutral">@color/neutral_normal_theme</item>
         <item name="neutralFaded">@color/neutral_faded_normal_theme</item>
         <item name="destructive">@color/fx_mobile_text_color_warning</item>
@@ -234,7 +233,6 @@
         <item name="foundation">@color/foundation_private_theme</item>
         <item name="above">@color/fx_mobile_private_layer_color_1</item>
         <item name="inset">@color/fx_mobile_private_layer_color_1</item>
-        <item name="tabRing">@color/tab_ring_private_theme</item>
         <item name="neutral">@color/neutral_private_theme</item>
         <item name="neutralFaded">@color/neutral_faded_private_theme</item>
         <item name="destructive">@color/fx_mobile_private_text_color_warning</item>