Add marginEnd to action buttons

to make it easier to tap the overflow menu icon
on the right edge of the action buttons.

app/src/main/res/layouts/mastodon/layout/drawer_status.xml

@@ -628,6 +628,7 @@
             android:layout_width="match_parent"
             android:layout_height="48dp"
             android:layout_marginStart="48dp"
+            android:layout_marginEnd="16dp"
             android:layout_marginTop="6dp"
             android:clipChildren="false"
             android:clipToPadding="false">