[fenix] For https://github.com/mozilla-mobile/fenix/issues/21973 - Remove @color/tab_tray_item_background_dark_theme redirection

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

@@ -60,7 +60,7 @@
     <!-- Tab tray -->
     <color name="tab_tray_item_text_normal_theme">@color/photonLightGrey05</color>
     <color name="tab_tray_item_url_normal_theme">@color/photonLightGrey60</color>
-    <color name="tab_tray_item_background_normal_theme">@color/tab_tray_item_background_dark_theme</color>
+    <color name="tab_tray_item_background_normal_theme">@color/photonDarkGrey80</color>
     <color name="tab_tray_item_selected_background_normal_theme">@color/tab_tray_item_selected_background_dark_theme</color>
     <color name="tab_tray_toolbar_background_normal_theme">@color/tab_tray_toolbar_background_dark_theme</color>
     <color name="tab_tray_item_divider_normal_theme">@color/tab_tray_item_divider_dark_theme</color>

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

@@ -36,7 +36,6 @@
     <color name="mozac_widget_favicon_border_dark_theme">@color/photonDarkGrey10</color>
 
     <!-- Tab Tray -->
-    <color name="tab_tray_item_background_dark_theme">@color/photonDarkGrey80</color>
     <color name="tab_tray_item_selected_background_dark_theme">#412E69</color>
     <color name="tab_tray_toolbar_background_dark_theme">@color/photonDarkGrey50</color>
     <color name="tab_tray_item_divider_dark_theme">@color/photonDarkGrey10</color>