sipcall/ice: Reset temporary ice session

The temporary ice session created by sipcall, might not be
properly released if the call is rejected by the user while
searching/connecting.

Change-Id: I053c2a4c4bd864c4dd4c73488175da30d1bf08db

src/sip/sipcall.cpp

@@ -910,6 +910,7 @@ SIPCall::removeCall()
     JAMI_WARN("[call:%s] removeCall()", getCallId().c_str());
     Call::removeCall();
     mediaTransport_.reset();
+    tmpMediaTransport_.reset();
     inv.reset();
     setTransport({});
 }