One pane borderless issue

[lostlang]

Issues with the Zellij UI

Issue description

If have only 1 pane with "borderless" and have any pane in "default_tab_template", borderless don't work. (if have 2 pane borderless work)

Minimal reproduction

layout {
	tab name="nvim"{
		pane {
			borderless true
			command "nvim"
		}
	}
	tab name="terminal"{
		pane split_direction="vertical"{
			pane borderless=true
			pane
		}
	}

	default_tab_template {
		children
		pane {
			size 1
			borderless true
			plugin location="zellij:status-bar"
		}
	}
}

[tymoyato]

#3704