Fix filter group icon being invisible in light theme

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

@@ -24,6 +24,7 @@
     <ImageView
         android:id="@+id/expand_icon"
         android:layout_width="wrap_content"
-        android:layout_height="wrap_content" />
+        android:layout_height="wrap_content"
+        android:tint="?attr/colorOnPrimary" />
 
 </LinearLayout>