bacon: Use the correct variable to determine boot animation

Use SIGN_BUILD instead of SIGNED_BUILD to determine if the fingerprint
should be fixed and which boot animation should be used.

Change-Id: I2520e69863c0b4c6e2db7250d58efb9fd58e8398
Merge branch 'cm-11.0' into stable/cm-11.0

Change-Id: I7b61733b43cf2cd16a1c2af4e3d5157e8f4054dc