Small pylint fixes

misago/threads/models/thread.py

@@ -86,7 +86,7 @@ class Thread(models.Model):
         blank=True,
         on_delete=models.SET_NULL,
     )
-    best_answer_is_protected =  models.BooleanField(default=False)
+    best_answer_is_protected = models.BooleanField(default=False)
     best_answer_marked_on = models.DateTimeField(null=True, blank=True)
     best_answer_marked_by = models.ForeignKey(
         settings.AUTH_USER_MODEL,

misago/threads/tests/test_threads_merge_api.py

@@ -31,7 +31,7 @@ class ThreadsMergeApiTests(ThreadsApiTestCase):
         self.category_b = Category.objects.get(slug='category-b')
 
     def override_other_category(self):
-        categories =  self.user.acl_cache['categories']
+        categories = self.user.acl_cache['categories']
 
         visible_categories = self.user.acl_cache['visible_categories']
         browseable_categories = self.user.acl_cache['browseable_categories']