Increased text contrast ratio of TextViews in 'Share tab' (#18880)

- Changed share_tab_url color to @color/photonLightGrey60
- Changed appName and recent_apps_link_header color to @color/photonDarkGrey10

app/src/main/res/layout/app_share_list_item.xml

@@ -33,6 +33,7 @@
         android:gravity="center|top"
         android:lines="2"
         android:textAlignment="gravity"
+        android:textColor="@color/photonDarkGrey10"
         android:textSize="10sp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"

app/src/main/res/layout/share_tab_item.xml

@@ -42,7 +42,7 @@
         android:textSize="12sp"
         android:maxLines="1"
         android:ellipsize="end"
-        android:textColor="?secondaryText"
+        android:textColor="@color/photonLightGrey60"
         tools:text="https://www.mozilla.org/en-US/firefox/new/"
         app:layout_constraintStart_toStartOf="@id/share_tab_title"
         app:layout_constraintTop_toBottomOf="@id/share_tab_title"

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

@@ -521,7 +521,7 @@
     <style name="ShareHeaderTextStyle">
         <item name="android:singleLine">true</item>
         <item name="android:textAllCaps">true</item>
-        <item name="android:textColor">?secondaryText</item>
+        <item name="android:textColor">@color/photonDarkGrey10</item>
         <item name="android:textSize">@dimen/share_header_text_size</item>
         <item name="android:textStyle">bold</item>
         <item name="fontFamily">@font/metropolis_semibold</item>