vendor: fix backuptool version check

before when we extracted the script from the new image
the version check was working already on backup
now we need to wait for restore to check if versions
are compatible. Fot that copy the build.prop file
into /tmp and use to check the version on restore

Change-Id: I4e463df60f15fd6d5d69e51bdd34693387ee72d3
1 file changed