Support power key on slideout

Change-Id: Ic1cba57b6d0fbefee2391d06d140da9e4e3dbb32
diff --git a/gui/theme/common/landscape.xml b/gui/theme/common/landscape.xml
index ff5dddd..8ca508f 100644
--- a/gui/theme/common/landscape.xml
+++ b/gui/theme/common/landscape.xml
@@ -4678,6 +4678,11 @@
 			</button>
 
 			<action>
+				<touch key="power"/>
+				<action function="togglebacklight"/>
+			</action>
+
+			<action>
 				<touch key="power+voldown"/>
 				<action function="screenshot"/>
 			</action>