fix missing trailing slash that was causing emmc and external_sd zips to not show up.
fix missing trailing slash that was causing emmc and external_sd zips to not show up.

Change-Id: I604f963ec3b10e43a7e95b7c473fa11891947b5b

DerTeufel/dualboot_recovery,DerTeufel/dualboot_recovery,randomblame/bootable_recovery,76Demented/bootable_recovery-,InsomniaAOSP/platform_bootable_recovery,randomblame/bootable_recovery,Plain-Andy/android_platform_bootable_recovery,kylinmoddev/android_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,76Demented/bootable_recovery-,InsomniaAOSP/platform_bootable_recovery,kylinmoddev/android_bootable_recovery,randomblame/bootable_recovery,kylinmoddev/android_bootable_recovery,InsomniaAOSP/platform_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,DerTeufel/dualboot_recovery,kylinmoddev/android_bootable_recovery,76Demented/bootable_recovery-,DerTeufel/dualboot_recovery,randomblame/bootable_recovery,76Demented/bootable_recovery-,randomblame/bootable_recovery,InsomniaAOSP/platform_bootable_recovery,InsomniaAOSP/platform_bootable_recovery,76Demented/bootable_recovery-,DerTeufel/dualboot_recovery