ProjectExplorer: Replace RunConfiguration::doAdditionalSetup

... by an explicit update() call. This is what effectively done in
most cases, and should be harmless and reasonably cheap in most other
cases.

Change-Id: I323112ec7cdbccf19050ac54466d8e1d97a0516e
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/python/pythonrunconfiguration.h

@@ -45,7 +45,6 @@ public:
     QString interpreter() const;
 
 private:
-    void doAdditionalSetup(const ProjectExplorer::RunConfigurationCreationInfo &) final;
     void updateLanguageServer();
 
     bool supportsDebugger() const;