don't try to use Hit Test in VR (#5005)

* don't try to use Hit Test in VR

* Convert if statement into one liner

Co-authored-by: Diego Marcos Segura <diego.marcos@gmail.com>

Author: AdaRoseCannon

src/components/scene/ar-hit-test.js

@@ -270,6 +270,9 @@ module.exports.Component = register('ar-hit-test', {
     }.bind(this));
 
     this.el.sceneEl.renderer.xr.addEventListener('sessionstart', function () {
+      // Don't request Hit Test unless AR (breaks WebXR Emulator)
+      if (!this.el.is('ar-mode')) { return; }
+
       var renderer = this.el.sceneEl.renderer;
       var session = this.session = renderer.xr.getSession();
       this.hasPosedOnce = false;