Enable pylint check E0211 (method has no argument) in .coafile

Adapt Attic013Item in test_attic013_acl_bug so that as_dict takes `self` as
first argument. This was the only case where E0211 was violated.

.coafile

@@ -24,7 +24,7 @@ pylint_disable = C0103, C0111, C0112, C0301, C0302, C0325, C0330, C0411, C0412,
                  W0511, W0603, W0611, W0612, W0613, W0614, W0621, W0622, W0702, W0703,
                  W1201, W1202, W1401, W1503, W1505,
                  R0101, R0201, R0204, R0902, R0903, R0904, R0911, R0912, R0913, R0914, R0915, R0916,
-                 E0102, E0202, E0211, E0401, E0611, E0702, E1101, E1102, E1120, E1133
+                 E0102, E0202, E0401, E0611, E0702, E1101, E1102, E1120, E1133
 pydocstyle_ignore = D100, D101, D102, D103, D104, D105, D200, D201, D202, D203, D204, D205, D209, D210,
                     D212, D213, D300, D301, D400, D401, D402, D403, D404
 

src/borg/testsuite/archiver.py

@@ -2975,7 +2975,7 @@ class ArchiverCheckTestCase(ArchiverTestCaseBase):
         # a b'acl'=None key-value pair.
         # This bug can still live on in Borg repositories (through borg upgrade).
         class Attic013Item:
-            def as_dict():
+            def as_dict(self):
                 return {
                     # These are required
                     b'path': '1234',
@@ -2994,7 +2994,7 @@ class ArchiverCheckTestCase(ArchiverTestCaseBase):
             manifest, key = Manifest.load(repository, Manifest.NO_OPERATION_CHECK)
             with Cache(repository, key, manifest) as cache:
                 archive = Archive(repository, key, manifest, '0.13', cache=cache, create=True)
-                archive.items_buffer.add(Attic013Item)
+                archive.items_buffer.add(Attic013Item())
                 archive.save()
         self.cmd('check', self.repository_location, exit_code=0)
         self.cmd('list', self.repository_location + '::0.13', exit_code=0)