RunControl: fix device passing to the doStart()

Brokken by the f1e973de79.

We must pass local `runnable` instead of runControl()->runnable(),
otherwise device member will be nullptr that breaks all non-Desktop run
configurations, like RemoteLinux one.

Change-Id: I0499008aee14cb3bbcc3e1ebda71c50533b6502e
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/projectexplorer/runcontrol.cpp

@@ -1193,7 +1193,7 @@ void SimpleTargetRunner::start()
     } else {
         Runnable runnable = runControl()->runnable();
         runnable.device = runControl()->device();
-        doStart(runControl()->runnable());
+        doStart(runnable);
     }
 }