Allow recovery to be restored if backup=1 flag is present in recovery.fstab

Change-Id: I426c8da8ae586004011ec4a103e1d7a1f23b3599
Merge commit 'refs/changes/69/5069/1' of https://gerrit.omnirom.org/android_bootable_recovery into android-4.4
Merge branch 'android-4.4' of https://github.com/omnirom/android_bootable_recovery into android-4.4
fix slash after directory

Change-Id: I74183c35751668df79312934181adcd6159b7f0e