Debugger: Fix reporting of special dumper formats for LLDB

E.g. for QImage etc.

Change-Id: I78201f55448a151d40d0d7fb10440a6cb87efd03
Task-number: QTCREATORBUG-10402
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/lldb/lldbengine.cpp

@@ -314,7 +314,7 @@ void LldbEngine::setupInferior()
 
     DebuggerCommand cmd1("loadDumpers");
     cmd1.callback = [this](const DebuggerResponse &response) {
-        watchHandler()->addDumpers(response.data);
+        watchHandler()->addDumpers(response.data["dumpers"]);
     };
     runCommand(cmd1);