[gnome-commander/Implement_CppCheck_suggestions] Use explicit keyword for constructor with one argument

[Uwe Scholz <uwescholz src gnome org>]

commit 7498f92577a5c09845192d322f015d4d673419a5
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Mon Apr 8 20:46:53 2019 +0200

    Use explicit keyword for constructor with one argument

 src/gnome-cmd-user-actions.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/gnome-cmd-user-actions.h b/src/gnome-cmd-user-actions.h
index 655a9969..a39fffeb 100644
--- a/src/gnome-cmd-user-actions.h
+++ b/src/gnome-cmd-user-actions.h
@@ -1,4 +1,4 @@
-/** 
+/**
  * @file gnome-cmd-user-actions.h
  * @copyright (C) 2001-2006 Marcus Bjurman\n
  * @copyright (C) 2007-2012 Piotr Eljasiak\n
@@ -183,13 +183,13 @@ class GnomeCmdUserActions
 
     struct const_iterator: ACTIONS_COLL::iterator
     {
-        const_iterator (const ACTIONS_COLL::iterator &i): ACTIONS_COLL::iterator(i)   {}
+        explicit const_iterator (const ACTIONS_COLL::iterator &i): ACTIONS_COLL::iterator(i) {}
 
         const ACTIONS_COLL::key_type &operator * () const                   {  return 
(ACTIONS_COLL::iterator::operator * ()).first;       }
     };
 
-    const_iterator begin()                                                  {  return action.begin();        
                              }
-    const_iterator end()                                                    {  return action.end();          
                              }
+    const_iterator begin()                                                  {  return (const_iterator) 
action.begin();                                      }
+    const_iterator end()                                                    {  return (const_iterator) 
action.end();                                        }
     unsigned size()                                                         {  return action.size();         
                              }
 
     const gchar *name(const_iterator &i)                                    {  return 
action_func[i->second.func].c_str();                 }