centralise niri-noctalia calculator config

dotfiles/kitagawa/niri.kdl

@@ -34,7 +34,6 @@ layout {
 }
 binds {
     Mod+B hotkey-overlay-title="Open web browser (Floorp)" { spawn "floorp"; }
-    Mod+C hotkey-overlay-title="Open calculator (Qalculate)" { spawn "noctalia" "msg" "panel-toggle" "yuuto/calculator:panel"; }
     Mod+E hotkey-overlay-title="Open file manager (Nautilus)" { spawn "nautilus" "-w"; }
 
     Mod+Comma { spawn "noctalia" "msg" "panel-toggle" "dunarand/bookmarks:panel" "search"; }