fix syntax

lib/menus/components/breath_bar.js

@@ -36,10 +36,12 @@ class BreathBar extends LitElement {
   }
 
   static get properties () {
+    return {
       playerInCreative: { type: Boolean },
       breathBubbles: { type: Number },
       showBreathBubbles: { type: Boolean }
     }
+  }
 
   constructor() {
     super()