Fix non-working "Do Not Install" button on "installsu" page.

* Applicable to non-rooted devices running portrait mode only.
* Touching the button has no effect, supposed to reboot/poweroff.

Change-Id: If67649c4c83ddf549c833f94c66829e0877969c5

gui/devices/portrait/res/portrait.xml

@@ -3594,7 +3594,7 @@
 			<object type="button">
 				<placement x="%col_center_x%" y="%row3_y%" />
 				<text>Do Not Install</text>
-				<image resource="main_button" />
+				<action function="set">tw_page_done=1</action>
 			</object>
 
 			<object type="slider">