histedit: fix call to _getgoal() by adding a byteskwargs() wrapper
I also added some b-prefixes while I was here because I got confused
and it seems silly to not just add them since it clarifies the whole
change.
Differential Revision: https://phab.mercurial-scm.org/D5585
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IncludeCategories:
- Regex: '^<'
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