backuptool: Add static version for backuptool to work

- So far it was using Bliss version and hence during version bumps it breaks backup tool and always updating version is not cool. Hence just pass a static version to it so that it works
as expected.

Signed-off-by: Jackeagle <jackeagle102@gmail.com>
Change-Id: If358a71fe8ef45f3180ed1e5e639c5bd27114c54
diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index 29f8818..a9be514 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -4,9 +4,9 @@
 #
 
 export C=/tmp/backupdir
+export V=11.0
 export SYSDEV="$(readlink -nf "$2")"
 export SYSFS="$3"
-export V=18.0
 
 # Scripts in /system/addon.d expect to find backuptool.functions in /tmp
 cp -f /tmp/install/bin/backuptool.functions /tmp
@@ -36,7 +36,7 @@
   echo "Backup/restore is not possible. Partition is probably empty"
   return 1
 fi
-if ! grep -q "^ro.bliss.version=$V.*" $S/build.prop; then
+if ! grep -q "^ro.bliss.static.version=$V.*" $S/build.prop; then
   echo "Backup/restore is not possible. Incompatible ROM version: $V"
   return 2
 fi