d3d11/swapchain: make initial color config logging less confusing

d3d11_sw_colorspace_hint is utilized both for runtime hints as well as the initial swap chain configuration to enable consistency between received swap chains and newly created ones.

As the arguments for this API are already pre-defined, an attribute is added to the private context that marks whether the initial configuration has taken place or not. If it has been, logging will talk about received hints. If not, logging will talk about initial configuration.