test: rename usage of line_num -> order in factories & tests

program/tests/factories.py

@@ -182,5 +182,5 @@ class PlaylistEntryFactory(DjangoModelFactory):
 
     duration = 73
     file_id = 42
-    line_num = Sequence(lambda n: int(n))
+    order = Sequence(lambda n: int(n))
     uri = f"file://0/{file_id}"

program/tests/test_playlists.py

@@ -27,7 +27,7 @@ def playlist_entries_data(show, file_id, entries=1):
         {
             "duration": random.uniform(1975, 2024),
             "file_id": file_id,
-            "line_num": n,
+            "order": n + 1,
             "uri": f"file://{show.id}/{file_id}",
         }
         for n in range(entries)