Allow iPhone Compass requestPermission()

[ttooo]

This isn't an issue, I found a fix, so if you want to add it for iPhone support it's good. By default on iPhone devices the compass access is not authorized, you can show this code to ensure the iPhone support will work after permission asked :

// Compass mode
      else if (!map.compassBearing.enabled()) {
        map.touchRotate.disable();
        // map.compassBearing.enable(); // -- before

        // new code added ---> start
        if (DeviceOrientationEvent && typeof DeviceOrientationEvent.requestPermission === "function") {
          DeviceOrientationEvent.requestPermission().then(function (permissionState) {
            if (permissionState === "granted") {
              map.compassBearing.enable();
            }
          });
        } else {
          map.compassBearing.enable();
        }
        // new code added <--- end
      }

[Raruto]

Thanks @ttooo, I can't test but please send a PR anyway.

👋 Raruto