Handle source code queries in no-callstack builds.

The symbol worker thread, which answers source code queries, only exists
when call stack support is compiled in. Handle the query directly in the
main thread so it is always answered and the server can terminate.

public/client/TracyProfiler.cpp

@@ -3980,7 +3980,14 @@ bool Profiler::HandleServerQuery()
         break;
 #endif
     case ServerQuerySourceCode:
+#ifdef TRACY_HAS_CALLSTACK
         QueueSourceCodeQuery( uint32_t( ptr ) );
+#else
+        TRACY_ASSERT( m_queryData );
+        HandleSourceCodeQuery( m_queryData, m_queryImage, uint32_t( ptr ) );
+        m_queryData = nullptr;
+        m_queryImage = nullptr;
+#endif
         break;
     case ServerQueryDataTransfer:
         if( m_queryData )