fix(eww-touch): fix middle button close window action

hl.dsp.window.close() is not a valid Hyprland Lua API method;
replace with hyprctl dispatch killactive.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

desktopenvs/hyprlua/eww-touch/eww.yuck

@@ -63,7 +63,7 @@
        :orientation "h"
        :space-evenly false
        :halign "center"
-       :onclick "hyprctl eval 'hl.dsp.window.close()'"
+       :onclick "hyprctl dispatch killactive"
        {""}
     )
     (button :class "music"