Debugger: Fix PdbEngine 'stepOut'

It's 'return', not 'finish'

Change-Id: I75bd7dc5f7caff2b63caa54badd958cb27e4e7e3
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/pdb/pdbengine.cpp

@@ -205,7 +205,7 @@ void PdbEngine::executeStepOut()
     resetLocation();
     notifyInferiorRunRequested();
     notifyInferiorRunOk();
-    postDirectCommand("finish");
+    postDirectCommand("return");
 }
 
 void PdbEngine::executeNext()