[core/media] make Opus consider rate different than default 48 kHz

In vars.xml , when you use codec settings like this:
<X-PRE-PROCESS cmd="set" data="internal_codec_prefs=OPUS@16000h@1c,PCMU,PCMA,G729"/>

The switch_core_media.c line 5520 only takes the OPUS default rate (48k) instead of 16k in the config.

Because of this, FS won't be able to choose opus if your client asks for 16k opus. You will see same log symptom as #2226

Co-authored-by: magiclin99 <magiclin99@gmail.com>

Author: ticpu

src/switch_core_media.c

@@ -5515,7 +5515,7 @@ SWITCH_DECLARE(uint8_t) switch_core_media_negotiate_sdp(switch_core_session_t *s
 				for (i = 0; i < smh->mparams->num_codecs && i < total_codecs; i++) {
 					const switch_codec_implementation_t *imp = codec_array[i];
 					uint32_t bit_rate = imp->bits_per_second;
-					uint32_t codec_rate = imp->samples_per_second;
+					uint32_t codec_rate = imp->actual_samples_per_second;
 
 					if (imp->codec_type != SWITCH_CODEC_TYPE_AUDIO) {
 						continue;