Themes: Define back arrow tint color for themes

This will make it easier to theme and keep stock look

Change-Id: I0385f7773a988c08e41acc1fd54bf32d13e0cddd
Signed-off-by: Bryan Owens <djbryan3540@gmail.com>
diff --git a/res/layout/search_bar_expanded.xml b/res/layout/search_bar_expanded.xml
index c530299..e5e180a 100644
--- a/res/layout/search_bar_expanded.xml
+++ b/res/layout/search_bar_expanded.xml
@@ -30,7 +30,7 @@
         android:src="@drawable/ic_back_arrow"
         android:background="?android:attr/selectableItemBackgroundBorderless"
         android:contentDescription="@string/action_menu_back_from_search"
-        android:tint="@color/actionbar_background_color" />
+        android:tint="@color/back_arrow_icon_tint_color" />
 
     <EditText
         android:id="@+id/search_view"
diff --git a/res/values/projekt_colors.xml b/res/values/projekt_colors.xml
index a5d6bd3..07d6963 100644
--- a/res/values/projekt_colors.xml
+++ b/res/values/projekt_colors.xml
@@ -19,4 +19,5 @@
     <color name="frequent_contact_text_color">@android:color/black</color>
     <color name="contact_tile_text_color">#ff202020</color>
     <color name="starred_quick_contact_name_text_color">@android:color/white</color>
+    <color name="back_arrow_icon_tint_color">@color/actionbar_background_color</color>
 </resources>