backuptool: Change version to 5.0

Change-Id: Ib5c1c7ee110168446a2e3277f920ef081e8b23a7
diff --git a/prebuilt/bin/backuptool.sh b/prebuilt/bin/backuptool.sh
index da0c95c..a32594b 100755
--- a/prebuilt/bin/backuptool.sh
+++ b/prebuilt/bin/backuptool.sh
@@ -5,7 +5,7 @@
 
 export C=/tmp/backupdir
 export S=/system
-export V=4.4
+export V=5.0
 
 # Preserve /system/addon.d in /tmp/addon.d
 preserve_addon_d() {