take const wxConfig object in wxDocManager::FileHistoryLoad() and wxFileHistory::Load() (patch 1942316) [should have been part of r53562]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53625 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/docview.h

@@ -350,7 +350,7 @@ public:
 
         @see wxConfigBase
     */
-    void FileHistoryLoad(wxConfigBase& config);
+    void FileHistoryLoad(const wxConfigBase& config);
 
     /**
         Removes the given menu from the list of menus managed by the file
@@ -1387,7 +1387,7 @@ public:
 
         @see wxConfigBase
     */
-    void Load(wxConfigBase& config);
+    void Load(const wxConfigBase& config);
 
     /**
         Removes the specified file from the history.