Quote dash-prefixed path arguments in PowerShell wrapper

[caomengxuan666]

Fixes one argument-passing edge case from #23.

In the PowerShell wrapper, bare arguments like -dash.txt are currently passed through unchanged. For .cmd targets running in Legacy native argument mode, PowerShell can split that token as -dash and .txt.

This change quotes extension-like dash-prefixed bare tokens before handing them to the .cmd entry point, while leaving ordinary bare globs unquoted so coreutils can still expand them.

Validated locally with the generated wrapper form:

cat -- '"-dash.txt"'
grep foo -- '"-dash.txt"'
cp -- '"-dash.txt"' dash-copy.txt

All three commands succeeded against a file named -dash.txt.