Fix #2383: [switch_core_media] Fix audio mode when SDP has recvonly in Session Attribute(a) instead of Media Attribute(a) #2393
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The switch_core_media_negotiate_sdp function was setting the media_audio_mode to sendonly when the SDP had a recvonly attribute, regardless of the current media mode. This caused one-way audio issues when renegotiating SDP while unhold. This patch adds an extra check to avoid overriding the existing media mode.