flag: fix parsing flag.FlagParser style short flags in to_struct[T]
#22172
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This PR corrects some misunderstandings about what flags the
flag.FlagParsersupports.Before:
--s <value>After:
-s <value>(or-sforboolfields)I decided to rename the
styleenumfrom.v_longto the more clear.v_flag_parser- I do not think the.v_longparsing style is much used in the wid used - so breakage in userland should be minimal.