omni: up backup script to a14

Change-Id: Iec6bd7f51338b57e9d58171548c7a8edb820a2c2
diff --git a/prebuilt/common/bin/backuptool_ab.functions b/prebuilt/common/bin/backuptool_ab.functions
index 770420b..e9111ad 100644
--- a/prebuilt/common/bin/backuptool_ab.functions
+++ b/prebuilt/common/bin/backuptool_ab.functions
@@ -5,7 +5,7 @@
 
 export S=/system
 export C=/postinstall/tmp/backupdir
-export V=13
+export V=14
 export backuptool_ab=true
 
 copy_file() {