Add static preview images to gesture settings.

Set the animation preview image view to the newly added preview image
instead of loading it from animation video.

Test: manual - launch gesture settings and visually check the animation
preview images.

Bug: 31636637

Change-Id: If25a0e3501bea0c6343326a143d665ec79e3d7c7

res/layout/gesture_preference.xml

@@ -74,6 +74,7 @@
                 android:id="@+id/gesture_image"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
+                android:scaleType="fitXY"
                 android:background="@color/gestures_setting_background_color"/>
 
             <ImageView