removemacai undo with no tweak names says nothing needs changing #57

removemacai apply with no names fails with "name the tweaks to apply, or a preset with --preset". removemacai undo with no names prints "Nothing to change. Everything named is already that way." even though nothing was named.

It should fail the way apply does, with something like "name the tweaks to undo". The argument handling is in Sources/removemacai/main.swift and TweakCommands.undo.