ProjectExplorer: Streamline OutputFormatter creation a bit

Note that the concept of a single monolithic OutputFormatter per
RunConfiguration (and why RunConfiguration, not RunControl to start
with?) is unchanged and suboptimal as one cannot easily combine
existing use cases, e.g. Python_and_Qt.

Change-Id: Ibeb8191020387324f22ed313230293597f96e36a
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/ios/iosrunconfiguration.h

@@ -47,7 +47,6 @@ public:
     explicit IosRunConfiguration(ProjectExplorer::Target *target);
 
     QWidget *createConfigurationWidget() override;
-    Utils::OutputFormatter *createOutputFormatter() const override;
     IosDeployStep *deployStep() const;
 
     QString commandLineArguments() const;