Refactor: avoid duplication in yazelix.kdl

[luccahuguet]

Clearly, there is code duplication. But I have yet to find a way to fix it, basically because I could not use a tab_template inside default_tab_template

layout {
    tab_template name="ui" {
        pane size=1 borderless=true {
           plugin location="zellij:tab-bar"
        }
        children
        pane size=1 borderless=true {
           plugin location="zellij:status-bar"
        }
    }

    default_tab_template {
        pane size=1 borderless=true {
           plugin location="zellij:tab-bar"
        }
        pane split_direction="vertical" {
            pane name="sidebar" {
                command "env"
                args "YAZI_CONFIG_HOME=~/.config/zellij/yazi/sidebar" "yazi"
            	size "20%"
            }
            pane {
                focus true
            }
        }
        pane size=1 borderless=true {
           plugin location="zellij:status-bar"
        }
    }
}