libs: pbutils: select extension profile by profile idc.

libs: pbutils: select extension profile by profile idc.

the old manner does not consider the profile idc. The profile idc should
play an more important role in recognizing the profile than the other
information. And there is no need to mix profiles of different extensions
together to find the closest profile when the bits stream is not standard,
different extensions support different features and should not be mixed.

The correct way should be recognize the extension category by profile idc
firstly, and then find the closest profile.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/645>