[Whitespace] Fix CRLF EOLs in `std.traits`.

CRLF EOLs were introduced in ea72723850202ed17c5b570715cefa7930f60ede commit of pull #1261.
Merge pull request #1622 from denis-sh/fix-std.traits-eol-fixup-pull-1261

[Whitespace] Fix CRLF EOLs in `std.traits`.