vendor-cyanogen: update mod version in backuptool

Hopefuly this restores some sanity for people that try
several builds a day.

Change-Id: I32fd6cb81238ab09f1560a676140383d95ed984c
diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index 18a9ae5..d716ec3 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -5,7 +5,7 @@
 
 C=/tmp/backupdir
 S=/system
-V=CyanogenMod-6
+V=CyanogenMod-7
 
 PROCEED=1;