libs: h265parser: Fix a bug for getting extension profile.

libs: h265parser: Fix a bug for getting extension profile.

We should use the traget ExtensionProfile's IDC to check the
profile_compatibility_flag, rather than the profile_idc in the
stream. The old profile_compatibility_flag check always return
true. This causes that profiles with same constraint flags but
different profile_idc can't be recognized correctly. For example,
the screen-extended-main-444 profile is always be recognized as
the high-throughput-444 profile.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1121>