[fenix] For https://github.com/mozilla-mobile/fenix/issues/22708 - Remove unused syncedTabsSeparator attribute

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

@@ -165,9 +165,6 @@
     <color name="top_site_pin_icon_color">@color/foundation_light_theme</color>
     <color name="top_sites_border_color">@color/photonDarkGrey90</color>
 
-    <!-- Synced tabs colors-->
-    <color name="synced_tabs_separator">@color/photonDarkGrey10</color>
-
     <!-- Collection icons-->
     <color name="collection_icon_color_violet">@color/photonViolet40</color>
     <color name="collection_icon_color_blue">@color/photonBlue30</color>

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

@@ -55,7 +55,6 @@
     <attr name="addOnPrivateBrowsingInteriorIconBackground" format="reference"/>
     <attr name="readerModeStartGradient" format="reference"/>
     <attr name="readerModeEndGradient" format="reference"/>
-    <attr name="syncedTabsSeparator" format="reference"/>
     <attr name="awesomeBarIndicatorColor" format="reference|color"/>
     <attr name="awesomeBarIndicatorBookmarkColor" format="reference|color"/>
 

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

@@ -245,9 +245,6 @@
     <color name="top_site_pin_icon_color">@color/photonDarkGrey80</color>
     <color name="top_sites_border_color">@color/photonLightGrey30</color>
 
-    <!-- Synced tabs colors-->
-    <color name="synced_tabs_separator">@color/photonLightGrey30</color>
-
     <!-- Collection icons-->
     <color name="collection_icon_color_violet">@color/photonViolet60</color>
     <color name="collection_icon_color_blue">@color/photonBlue60</color>

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

@@ -78,7 +78,6 @@
         <item name="mozacPromptLoginEditTextCursorColor">@color/prompt_login_edit_text_cursor_color_normal_theme</item>
         <item name="readerModeStartGradient">@color/readermode_start_gradient_normal_theme</item>
         <item name="readerModeEndGradient">@color/readermode_end_gradient_normal_theme</item>
-        <item name="syncedTabsSeparator">@color/synced_tabs_separator</item>
         <item name="awesomeBarIndicatorColor">@color/search_suggestion_indicator_icon_color_normal_theme</item>
         <item name="awesomeBarIndicatorBookmarkColor">@color/search_suggestion_indicator_icon_bookmark_color_normal_theme</item>
         <item name="selectLoginHeaderTextColor">@color/select_login_header_normal_theme</item>