fix: remove empty args string from default config

[toby-bro]

It seems that this https://github.com/wtfutil/wtf/issues/1197 issue was not fully adressed as a default install also broke because of the empty string args in uptime when I installed wtf by cloning the repo and using go install .

This completes https://github.com/wtfutil/wtf/pull/1296 and fixes https://github.com/wtfutil/wtf/issues/1197

[toby-bro]

It passes the CI once https://github.com/wtfutil/wtf/pull/1720 is merged

[FelicianoTech]

Another good one. Thank you.