🪲 Fix fire preset menu

src/effects/Fire.js

@@ -211,7 +211,7 @@ export default class Effect {
 
       const menu      = Gio.Menu.new();
       const group     = Gio.SimpleActionGroup.new();
-      const groupName = 'presets';
+      const groupName = 'fire-presets';
 
       // Add all presets.
       presets.forEach((preset, i) => {

src/effects/Mushroom.js

@@ -322,7 +322,7 @@ export default class Effect {
         // selections.
         const menu      = Gio.Menu.new();
         const group     = Gio.SimpleActionGroup.new();
-        const groupName = 'presets';
+        const groupName = 'mushroom-presets';
 
         // Iterate over the presets to populate the menu.
         presets.forEach((preset, i) => {