Fix linting issues

aleksis/apps/buelleten/apps.py

@@ -10,6 +10,4 @@ class DefaultConfig(AppConfig):
         "Repository": "https://edugit.org/AlekSIS/onboarding//AlekSIS-App-Buelleten",
     }
     licence = "EUPL-1.2+"
-    copyright_info = (
-        ([2022], "Tom Teichler", "tom.teichler@teckids.org"),
-    )
+    copyright_info = (([2022], "Tom Teichler", "tom.teichler@teckids.org"),)

aleksis/apps/buelleten/menus.py

@@ -10,8 +10,7 @@ MENUS = {
                 "menu_generator.validators.is_authenticated",
                 "aleksis.core.util.core_helpers.has_person",
             ],
-            "submenu": [
-            ],
+            "submenu": [],
         }
     ]
 }

aleksis/apps/buelleten/models/slides.py

@@ -43,4 +43,3 @@ class UploadedFileSlide(Slide):
 class StaticContentSlide(Slide):
 
     content = RichTextField(verbose_name=_("Content"))
-