fix(mac): kmp.inf is windows-1252

Relates to #5316.

Keyman for mac is still reading from kmp.inf, but was treating it as
UTF-8. However, it is windows-1252 encoding. This was stopping Keyman
from loading the file due to the presence of a (C) symbol.

Keyman for mac *should* be loading kmp.json. This needs to be addressed
as a separate issues.