[MultiView] Recreate resolve layers if user calls RenderStage::setFrameBufferObject or RenderStage::setMultisampleResolveFramebufferObject

[madsbuvi]

As-is, a multisampled multiview fbo will be unable to resolve if the user calls RenderStage::setFrameBufferObject or RenderStage::setMultisampleResolveFramebufferObject because the resolve layers will resolve between the old pair of framebuffers.

This PR proposes a fix to this issue by recreating the resolve layer framebuffers whenever fbos are changed by the user.