Remove keyword workspace in mapWorkspacesToMonitors as it doesnt work anyway

[zjeffer]

Closes #37

Two issues with this line:

• The correct command is `hyprctl keyword workspace ,monitor:<monitor_name>
• The line doesn't do anything anyway because we're reloading the config afterwards, which removes all workspacerules set by the plugin. This is why we have to use the workaround in writeWorkspaceRules.