Corrige bug na migração dos banners dos eventos

sigi/apps/eventos/migrations/0045_alter_evento_banner.py

@@ -11,7 +11,8 @@ def forwards(apps, schema_editor):
     for e in Evento.objects.exclude(banner="").exclude(banner=None):
         old_file = Path(e.banner.path)
         if old_file.exists():
-            new_file = upload_to / e.banner.name
+            new_file = upload_to / old_file.name
+            if not old_file.samefile(new_file):
                 old_file.rename(new_file)
                 e.banner = str(new_file.resolve())
         else:
@@ -24,7 +25,8 @@ def backwards(apps, schema_editor):
     for e in Evento.objects.exclude(banner="").exclude(banner=None):
         new_file = Path(e.banner.path)
         if new_file.exists():
-            old_file = settings.MEDIA_ROOT / e.banner.name
+            old_file = settings.MEDIA_ROOT / new_file.name
+            if not old_file.samefile(new_file):
                 new_file.rename(old_file)
                 e.banner = str(old_file.resolve())
         else: