manager: fix nullptr access in Manager::sendCallTextMessage

Call::getCallId() method is accessed in a nullptr pointer context.
This patch fix it by using the user given callId.

Issue: #82045
Change-Id: I8700aeaa173706909cf303be6d1efff5a4d1fc44

src/manager.cpp

@@ -1662,7 +1662,7 @@ Manager::sendCallTextMessage(const std::string& callID,
     } else {
         auto call = getCallFromCallID(callID);
         if (not call) {
-            RING_ERR("Failed to send message to %s: inexistant call ID", call->getCallId().c_str());
+            RING_ERR("Failed to send message to %s: inexistant call ID", callID.c_str());
             return;
         }