[config] fix using same key multiple times with 'apply' (#7127)

gallery_dl/config.py

@@ -322,6 +322,7 @@ class apply():
             set(path, key, value)
 
     def __exit__(self, exc_type, exc_value, traceback):
+        self.original.reverse()
         for path, key, value in self.original:
             if value is util.SENTINEL:
                 unset(path, key)

gallery_dl/version.py

@@ -6,5 +6,5 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.29.2"
+__version__ = "1.29.3-dev"
 __variant__ = None

test/test_config.py

@@ -168,6 +168,7 @@ class TestConfig(unittest.TestCase):
         options = (
             (("b",)    , "c", [1, 2, 3]),
             (("e", "f"), "g", 234),
+            (("e", "f"), "g", 234),
         )
 
         self.assertEqual(config.get(("b",)    , "c"), "text")