Fix backuptool issue

We consider CRDRODI_VERSION to comparison in backuptool.sh and also everything before the first dot: check here -> "if ( ! grep -q "^ro.crdroid.version=$V.*" /system/build.prop ); then"
Let's remove build prop adittions whitout CRDROID_VERSION_MINOR or the first dot will come right before the .zip

Change-Id: I6c9cce86e36e59efb867750c4226d1121ea32c75