fix: resolve current account home directory

[Max-Sum]

NSHomeDirectoryForUser could return a container path instead of user directory.
Use getpwuid_r(getuid()) instead.

And also fix the hard-coded path in keymapping.

Just tried building with the latest source code, but NSHomeDirectoryForUser(userName) doesn’t seem to be working.

It returns /Users/$USER/Library/Containers/{App_Bundle_ID}/Data instead of /Users/$USER.

Originally posted by @viatearz in #221 (comment)