releasetools: Don't extract BOOTABLE_IMAGES when signing target files
boot and recovery images need to be re-created during the signing process to ensure that the proper keys are embedded in the images. Don't extract the BOOTABLE_IMAGES path if it exists in the source target files to avoid re-using the prebuilt versions. Change-Id: Icdf61367efc2364f89c7ab1c61a81536431aea2e Ticket: CYNGNOS-1994
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