Make system read only show no matter what on first TWRP boot

Initial value for tw_mount_system_ro is now 2. If the value of
tw_mount_system_ro is 2 during boot, then we will show the system
read only prompt and ignore the value from the lifetime writes
check.

Note: Changed the value of FILE_VERSION which will trigger the
data manager to throw out previous settings and start with default
values so that existing TWRP users will get the prompt at least
once.

Change-Id: I447767b64617f855156a19a5dc15c4ece6dff7b8
diff --git a/gui/devices/portrait/res/portrait.xml b/gui/devices/portrait/res/portrait.xml
index cf113ef..969044c 100644
--- a/gui/devices/portrait/res/portrait.xml
+++ b/gui/devices/portrait/res/portrait.xml
@@ -3675,7 +3675,7 @@
 
 			<object type="text">
 				<placement x="%center_x%" y="%row1_header_y%" placement="5" />
-				<text>TWRP has detected an unmodified system partition.</text>
+				<text>Keep System Read Only?</text>
 			</object>
 
 			<object type="text">