Revert "ArcballControls: Clean up."

This reverts commit 9a836651e6ae8c7c4f7434cd8121e5b6fdc06274.

examples/jsm/controls/ArcballControls.js

@@ -1037,9 +1037,9 @@ class ArcballControls extends EventDispatcher {
 
 							}
 
-							_v3_1.setFromMatrixPosition( this._gizmoMatrixState );
+							this._v3_1.setFromMatrixPosition(this._gizmoMatrixState);
 
-							this.applyTransformMatrix( this.scale( size, _v3_1 ) );
+							this.applyTransformMatrix( this.scale( size, this._v3_1 ) );
 
 						}