Revert "Use standard CM bootanimation for unsigned CM builds"

Seriously, what the fuck?  I like the OPO boot screen so I'm gonna keep it.

This reverts commit 0a6dd761231b4c9efd00a42d7a7965a26d89325a.

Conflicts:
	cm.mk

Change-Id: I2c42d78768c949c4e57231ea7564ef3f34cdc17a