[Panlingual] Change Checkbox color and remove divider of listview

Bug: 229104704
Bug: 229825310
Test: local
Change-Id: I948d963b1d3d7c86b996170cb849f50635bc464b

core/java/com/android/internal/app/LocalePickerWithRegion.java

@@ -230,6 +230,7 @@ public class LocalePickerWithRegion extends ListFragment implements SearchView.O
         // In order to make the list view work with CollapsingToolbarLayout,
         // we have to enable the nested scrolling feature of the list view.
         getListView().setNestedScrollingEnabled(true);
+        getListView().setDivider(null);
     }
 
     @Override

core/res/res/layout/app_language_picker_current_locale_item.xml

@@ -39,6 +39,6 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:src="@drawable/ic_check_24dp"
-            app:tint="#0F9D58"/>
+            app:tint="?attr/colorAccentPrimaryVariant"/>
     </LinearLayout>
 </LinearLayout>

core/res/res/layout/app_language_picker_system_current.xml

@@ -40,6 +40,6 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:src="@drawable/ic_check_24dp"
-            app:tint="#0F9D58"/>
+            app:tint="?attr/colorAccentPrimaryVariant"/>
     </LinearLayout>
 </LinearLayout>