Autotest: Drop one use of Runnable::device

Change-Id: I9830af1a5a558d9df64aff2a9e12a803720f2ab7
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/testrunconfiguration.h

@@ -69,8 +69,6 @@ public:
         r.commandLineArguments = m_testConfig->argumentsForTestRunner().join(' ');
         r.workingDirectory = m_testConfig->workingDirectory().toString();
         r.environment = m_testConfig->environment();
-        r.device = ProjectExplorer::DeviceManager::instance()->defaultDevice(
-                    ProjectExplorer::Constants::DESKTOP_DEVICE_TYPE);
         return r;
     }