runconfig: consolidate createConfigurationWidget implementations

Most derived classes used essentially identical 'return 0;'
implementations. Use a base class implementation doing that instead.

Change-Id: I99727ac2230a5d9f168b4b0eb5927f8efff44e64
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/android/androidrunfactories.h

@@ -80,7 +80,6 @@ public:
     ~AndroidRunControlFactory();
 
     QString displayName() const;
-    RunConfigWidget *createConfigurationWidget(RunConfiguration *runConfiguration);
 
     bool canRun(RunConfiguration *runConfiguration,
                 ProjectExplorer::RunMode mode) const;