fix(cli): tag enum arg for ws layout rule cmd

This commit ensures that the final argument of the
'workspace-layout-rule' command, which takes a variant of the
DefaultLayout enum, is properly labelled with the #[arg_enum] tag so
that serialization and deserialization works as expected with other
commands that take a DefaultLayout enum variant as an arg.

fix #171

komorebic/src/main.rs

@@ -212,6 +212,7 @@ pub struct WorkspaceLayoutRule {
     /// The number of window containers on-screen required to trigger this layout rule
     at_container_count: usize,
 
+    #[clap(arg_enum)]
     layout: DefaultLayout,
 }