Support alternative .android_secure location

Some devices (jewel, m8) have .android_secure at a non-standard
location. Allow a different partition to be specified as the home of
.android_secure using the fstab flag 'andsec'.

Using the /data/media variant of jewel as an example, recovery.fstab or
twrp.fstab could be edited like follows:

/external_sd  vfat  /dev/block/mmcblk1p1  flags=display="MicroSD";andsec

Note, this is NOT a method to move .android_secure in your ROM. Your ROM
must already write to this alternative location.

Change-Id: I3a6e4e63aaddb35870b79e80938b0f9c2c902443
diff --git a/gui/devices/1600x2560/res/ui.xml b/gui/devices/1600x2560/res/ui.xml
index dcfd956..1873d0b 100644
--- a/gui/devices/1600x2560/res/ui.xml
+++ b/gui/devices/1600x2560/res/ui.xml
@@ -1121,7 +1121,10 @@
 			</object>
 
 			<object type="text" color="%text_color%">
-				<condition var1="tw_has_data_media" var2="0" />
+				<conditions>
+					<condition var1="tw_has_android_secure" var2="1" />
+					<condition var1="fileexists" var2="/and-sec" />
+				</conditions>
 				<font resource="font" />
 				<placement x="%center_x%" y="%row3_text_y%" placement="5" />
 				<text>.android_secure</text>