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/git/gitplugin.cpp

@@ -399,7 +399,6 @@ public:
 
     void onApplySettings();
 
-    GitSettings setting;
     CommandLocator *m_commandLocator = nullptr;
 
     QAction *m_menuAction = nullptr;