Fix handling of direct connection offers to prevent the remote side from adding media streams.
Fix handling of direct connection offers to prevent the remote side from adding media streams.

Havi4/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,JeeLiu/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,respoke/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,respoke/respoke-sdk-ios,JeeLiu/respoke-sdk-ios,Havi4/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,respoke/respoke-sdk-ios,Havi4/respoke-sdk-ios,JeeLiu/respoke-sdk-ios