Vcs: Convert settings pages to latest style

Last change in that area for this year.

Change-Id: Ibae9f1869cb20faf85c0c1669b84751ad022b8fd
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/mercurial/mercurialplugin.cpp

@@ -169,7 +169,6 @@ private:
     void createRepositoryActions(const Core::Context &context);
 
     // Variables
-    MercurialSettings m_settings;
     MercurialClient m_client;
 
     Core::CommandLocator *m_commandLocator = nullptr;