ProjectExplorer: Simplify collection of RunConfigurationCreationInfos

Instead of calling twice for AutoCreated and UserCreated, call once
and record to which case it belongs. Only the 'both' and
'user only' combination are ever used.

Change-Id: I9c15085bcbb4bf6584a6156135f2084dbfc51c1c
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/pythoneditor/pythoneditorplugin.cpp

@@ -271,10 +271,8 @@ public:
         addSupportedProjectType(PythonProjectId);
     }
 
-    QList<RunConfigurationCreationInfo> availableCreators(Target *parent,
-                                                          CreationMode mode) const override
+    QList<RunConfigurationCreationInfo> availableCreators(Target *parent) const override
     {
-        Q_UNUSED(mode);
         return Utils::transform(parent->project()->files(Project::AllFiles),[this](const FileName &fn) {
             return convert(fn.toString(), fn.toString());
         });