Allow close help and tree dialogs using ctrl-g shortcut (SIGINT).

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

src/filemanager/tree.c

@@ -1105,9 +1105,10 @@ tree_execute_cmd (WTree * tree, unsigned long command)
     case CK_Delete:
         tree_rmdir (tree);
         break;
-    case CK_Cancel:
-        /* don't close tree due to SIGINT */
-        break;
+    case CK_Quit:
+        if (!tree->is_panel)
+            dlg_stop (((Widget *) tree)->owner);
+        return res;
     default:
         res = MSG_NOT_HANDLED;
     }

src/help.c

@@ -917,9 +917,6 @@ help_execute_cmd (unsigned long command)
     case CK_Quit:
         dlg_stop (whelp);
         break;
-    case CK_Cancel:
-        /* don't close help due to SIGINT */
-        break;
     default:
         ret = MSG_NOT_HANDLED;
     }