remove BETA_PROMO setting

settings.py

@@ -716,9 +716,6 @@ ENGAGE_ROBOTS = False
 # Read-only mode setup.
 READ_ONLY = False
 
-# Do you want the Fx4 beta promo to show up?  bug 592690
-BETA_PROMO = True
-
 
 # Turn on read-only mode in settings_local.py by putting this line
 # at the VERY BOTTOM: read_only_mode(globals())