use __return_false|true instead of create_function
|Reported by:||TobiasBg||Owned by:|
The newly added functions __return_false and __return_true from #12381 should be used throughout core to replace those ugly create_function( ..., 'return true|false;' ); calls.
A quick grep only showed one occurance though, which can be changed with the attached patch.
I also suggest back-porting those two functions to BackPress.