Remove redundant special case in STG pretty-printer

This special case existed for no reason, and made things inconsistent.

Before

    Boolean.$bT :: Boolean.Boolean
    [GblId, Str=m, Unf=OtherCon []] =
        CAF_ccs  \ u  []  Boolean.$bT1;

After

    Boolean.$bF :: Boolean.Boolean
    [GblId, Str=m, Unf=OtherCon []] =
        \u [] Boolean.$bF1;

The cost-centre is now hidden when not profiling, as is the case with
other types of closures.