ota_from_target_files: remove duplicate setting of recovery_img

This variable is already set earlier in the script and does not need
to be wrapped inside of the if statement

Change-Id: I91b7f7d2fc911a3910b3df09cff0ca0f44fe7741
Merge remote-tracking branch 'cyanogen/cm-11.0' into cm-11.0

Conflicts:
	tools/releasetools/ota_from_target_files