fix(popover-edit): remove fallthroughs in switch statement

Author: josephperrott

src/cdk-experimental/popover-edit/lens-directives.ts

@@ -115,10 +115,10 @@ export class CdkEditControl<FormValue> implements OnDestroy, OnInit {
       case 'submit':
         // Manually cause the form to submit before closing.
         this._triggerFormSubmit();
-        // Fall through
+        break;
       case 'close':
         this.editRef.close();
-        // Fall through
+        break;
       default:
         break;
     }