Completion fails with 1st level shortcut

[rwxrob]

It seems that completion expansion does not work for multiple levels for based commands within a monolith. This is possibly only affecting the 1-level commands.

So within a z monolith with z keg node command:

	Shortcuts: Z.ArgMap{
		"kn":        {"keg", "node"},
	},

Tapping tab on z kn becomes z node and not z keg node.