[XR] correct rotation application in RHS (#13596)

Author: RaananW

packages/dev/core/src/XR/webXRCamera.ts

@@ -175,6 +175,8 @@ export class WebXRCamera extends FreeCamera {
         this._lastXRViewerPose = undefined;
     }
 
+    private _rotate180 = new Quaternion(0, 1, 0, 0);
+
     private _updateFromXRSession() {
         const pose = this._xrSessionManager.currentFrame && this._xrSessionManager.currentFrame.getViewerPose(this._xrSessionManager.referenceSpace);
         this._lastXRViewerPose = pose || undefined;
@@ -260,6 +262,8 @@ export class WebXRCamera extends FreeCamera {
                 currentRig.position.z *= -1;
                 currentRig.rotationQuaternion.z *= -1;
                 currentRig.rotationQuaternion.w *= -1;
+            } else {
+                currentRig.rotationQuaternion.multiplyInPlace(this._rotate180);
             }
             Matrix.FromFloat32ArrayToRefScaled(view.projectionMatrix, 0, 1, currentRig._projectionMatrix);