Add start to widget app name layout gravity

This fixes the alignment issue in RTL. Seems like the default is start
if layout_gravity isn't set, but if you set layout_gravity to
center_vertical, you need to explicitly set start or it will go to the
left.

Bug: 188147009
Test: validated locally and in AS layout preview
Change-Id: Ic4b4d7e6dfe03e1e6dd3ead5c3821e77261b4bb5
diff --git a/res/layout/widgets_list_row_header.xml b/res/layout/widgets_list_row_header.xml
index f20af87..a0a0456 100644
--- a/res/layout/widgets_list_row_header.xml
+++ b/res/layout/widgets_list_row_header.xml
@@ -48,7 +48,7 @@
             android:id="@+id/app_title"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:layout_gravity="center_vertical"
+            android:layout_gravity="start|center_vertical"
             android:textColor="?android:attr/textColorPrimary"
             android:textSize="16sp"
             tools:text="App name" />