Metal View update not working

When updating metal view in the case where system manages to re-use the same address bgfx will skip it due to that exact reason. Even though it is completally new allocated view on the native (system, iOS) side.

https://github.com/BabylonJS/bgfx/blob/master/src/renderer_mtl.mm#L1588-L1593

**To Reproduce**
allocate view `[[MTKView alloc] init]`
update view allocated view. and dealocate it, while
allocating a new one `[[MTKView alloc] init]` and updating view with it.

It is all timing depended but you can see the view re-uses same address, where the layer is brand new

**Expected behavior**
View should be updated.

- Platform: iOS