Revert "RECOVERY_VARIANT := twrp"

I've to fix the twrp.fstab so compile cwm until I fix it. :)

This reverts commit 93f46f3f7e8a02a8b602aca0f6a53034ada2ca0e.

Change-Id: I3b64669bbd793bec701c6308d65932dd4885053d