Added color for "Share" menu's "Recently Used" in Dark theme

- Created a separate attribute recentlyUsedSharedMenu to be used by 'recently used' panel of tab share menu
- It specifies colors to be used for Light and Dark theme

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

@@ -3,6 +3,6 @@
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 <shape xmlns:android="http://schemas.android.com/apk/res/android">
-    <solid android:color="?inset"/>
+    <solid android:color="?recentlyUsedShareMenu"/>
     <corners android:radius="@dimen/share_recent_apps_background_radius"/>
 </shape>

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

@@ -54,6 +54,7 @@
     <color name="preference_section_header_normal_theme">@color/preference_section_header_dark_theme</color>
     <color name="notification_accent_color_normal_theme">@color/accent_high_contrast_dark_theme</color>
     <color name="menu_item_button_normal_theme">@color/accent_high_contrast_dark_theme</color>
+    <color name="recently_used_share_theme">@color/recently_used_share_menu_dark_theme</color>
 
     <color name="mozac_widget_favicon_background_normal_theme">@color/mozac_widget_favicon_background_dark_theme</color>
     <color name="mozac_widget_favicon_border_normal_theme">@color/mozac_widget_favicon_border_dark_theme</color>

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

@@ -27,6 +27,7 @@
     <attr name="toolbarDivider" format="reference"/>
     <attr name="menuCategoryText" format="reference"/>
     <attr name="preferenceSectionHeader" format="reference"/>
+    <attr name="recentlyUsedShareMenu" format="reference" />
 
     <!-- Color used in DefaultToolbarMenu for buttons placed at the end of menu items -->
     <attr name="menuItemButtonTintColor" format="reference"/>

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

@@ -82,7 +82,7 @@
     <color name="contrast_text_dark_theme">@color/primary_text_dark_theme</color>
     <color name="caption_text_dark_theme">@color/photonLightGrey70</color>
     <color name="foundation_dark_theme">#1C1B22</color>
-    <color name="inset_dark_theme">@color/photonDarkGrey10</color>
+    <color name="inset_dark_theme">#32313C</color>
     <color name="above_dark_theme">#32313C</color>
     <color name="accent_dark_theme">#9059FF</color>
     <color name="accent_bright_dark_theme">#592ACB</color>
@@ -123,6 +123,7 @@
     <color name="search_suggestion_indicator_icon_color_dark_theme">#2ac3a2</color>
     <color name="search_suggestion_indicator_icon_bookmark_color_dark_theme">#0090ed</color>
     <color name="preference_section_header_dark_theme">@color/accent_high_contrast_dark_theme</color>
+    <color name="recently_used_share_menu_dark_theme">@color/photonDarkGrey10</color>
 
     <color name="mozac_widget_favicon_background_dark_theme">@color/photonDarkGrey50</color>
     <color name="mozac_widget_favicon_border_dark_theme">@color/photonDarkGrey10</color>
@@ -251,6 +252,7 @@
     <color name="mozac_widget_favicon_border_normal_theme">@color/mozac_widget_favicon_border_light_theme</color>
     <color name="notification_accent_color_normal_theme">@color/accent_bright_light_theme</color>
     <color name="menu_item_button_normal_theme">@color/menu_item_button_light_theme</color>
+    <color name="recently_used_share_theme">@color/inset_light_theme</color>
 
     <!-- Tab tray -->
     <color name="tab_tray_item_text_normal_theme">@color/tab_tray_item_text_light_theme</color>

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

@@ -83,6 +83,7 @@
         <item name="selectLoginHeaderTextColor">@color/select_login_header_normal_theme</item>
         <item name="preferenceSectionHeader">@color/preference_section_header_normal_theme</item>
         <item name="menuItemButtonTintColor">@color/menu_item_button_normal_theme</item>
+        <item name="recentlyUsedShareMenu">@color/recently_used_share_theme</item>
 
         <!-- Shared widget colors -->
         <item name="mozac_primary_text_color">@color/primary_text_normal_theme</item>