_compareCommandNames should use locale-aware string comparisons

[_compareCommandNames ](https://github.com/microsoft/terminal/blob/934ad98786e33407e5549c36e2288601a3a083d8/src/cascadia/TerminalApp/CommandPalette.cpp#L253)operates on strings that are presented to the end-user, so it should sort like a human, not by codepoint.  I'm not sure whether this project prefers `CompareStringEx` or `lstrcmp` or some CRT routine.