[perl #58032] [BUG] languages/perl6/t/pmc/perl6multisub-dispatch-tiebreak.t: filename is too long

[James Keenan via RT]

In r30288, renamed the file by omitting '-dispatch'.  Renamed two
siblings for consistency.  Changed names within these 3 files.  Rebuilt.
 Ran 'prove' on the directory in question.  All tests continue to pass.
 Resolving ticket.