Fix SDL_EnumerateDirectory(/) failing on POSIX and Windows. #14661
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Description
Root cause was a bug in the internal
SDL_SYS_EnumerateDirectoryimplementation which overtrimmed, leading to paths like/being read asemptyand/.being read as/This bug effected Linux and Mac and a similar pattern was found in the Window's codepath for this implementation but there seems to be some fallback logic there for empty strings. Nonetheless, fixed overtrimming there as well.
Existing Issue(s)
Fixes #14637