Stop call ring sound immediately on accept

tools/chatgui/src/callwindow.cpp

@@ -287,6 +287,7 @@ void CallWindow::postCallFn(void (*fn)(void*), uint64_t callId) {
 }
 
 void CallWindow::onAccept() {
+    SoundManager::instance()->stopLoop();
     setState(Active);
     postCallFn(call_accept_trampoline, m_callId);
 }