vendor: remove gapps backup also from postinstall

Change-Id: I77a68d93ee1e3700f94d206dfd4d3cb8fb20f530
diff --git a/prebuilt/addon.d/69-gapps.sh b/prebuilt/addon.d/69-gapps.sh
index f133b87..c9c6bff 100755
--- a/prebuilt/addon.d/69-gapps.sh
+++ b/prebuilt/addon.d/69-gapps.sh
@@ -131,7 +131,6 @@
     done
   ;;
   pre-backup)
-    rm /system/addon.d/70-gapps.sh
   ;;
   post-backup)
     # Stub
diff --git a/prebuilt/common/bin/backuptool_ab.sh b/prebuilt/common/bin/backuptool_ab.sh
index 31dd26e..b96c594 100755
--- a/prebuilt/common/bin/backuptool_ab.sh
+++ b/prebuilt/common/bin/backuptool_ab.sh
@@ -18,6 +18,7 @@
   if [ -d /system/addon.d/ ]; then
     mkdir -p /postinstall/tmp/addon.d/
     cp -a /system/addon.d/* /postinstall/tmp/addon.d/
+    rm -f /postinstall/tmp/addon.d/70-gapps.sh
 
     # Discard any scripts that aren't at least our version level
     for f in /postinstall/tmp/addon.d/*sh; do
@@ -29,7 +30,6 @@
         rm $f
       fi
     done
-
     chmod 755 /postinstall/tmp/addon.d/*.sh
   fi
 }