More accessibility improvements

Add missing content description and increase tap target sizes.

Fixes: 129216367
Fixes: 129226741
Fixes: 129216366
Change-Id: I0692891f720cfd963fc58a834d43ff7c9d5ad157
diff --git a/res/layout/fragment_theme_picker.xml b/res/layout/fragment_theme_picker.xml
index e20c5f9..ffc2d7b 100644
--- a/res/layout/fragment_theme_picker.xml
+++ b/res/layout/fragment_theme_picker.xml
@@ -51,6 +51,7 @@
                 android:layout_height="wrap_content"
                 android:layout_alignParentStart="true"
                 android:layout_centerVertical="true"
+                android:minHeight="@dimen/min_taptarget_height"
                 android:text="@string/keep_my_wallpaper"/>
             <Button
                 android:id="@+id/apply_button"