Fix PAL caching subtitle streams issue

This issue seemed to only happen specifically when the `update_strategy` was set to `next`, setting it to `all` never seemed to run into this issue.

Fixes RemiRigal#109

.dockerignore

@@ -21,3 +21,4 @@ README.md
 
 # Application-specific files and directories
 tests/
+config.example.yaml

config.example.yaml

@@ -7,8 +7,8 @@ plexautolanguages:
 
   # Update all episodes of the show/season or only the next ones
   # Accepted values:
-  #   - all (default)
-  #   - next
+  #   - all
+  #   - next (default)
   update_strategy: "next"
 
   # Whether or not playing a file should trigger a language update, defaults to 'true'

main.py

@@ -11,7 +11,7 @@
 from plex_auto_languages.utils.healthcheck import HealthcheckServer
 
 # Version information
-__version__ = "1.3.1-dev1"
+__version__ = "1.3.1-dev2"
 
 class PlexAutoLanguages:
     """

plex_auto_languages/alerts/playing.py

@@ -78,7 +78,7 @@ def process(self, plex: PlexServer):
         )
         if item.key in plex.cache.default_streams and plex.cache.default_streams[item.key] == pair_id:
             return
-        plex.cache.default_streams.setdefault(item.key, pair_id)
+        plex.cache.default_streams[item.key] = pair_id
 
         # Change tracks if needed
         plex.change_tracks(username, item, EventType.PLAY_OR_ACTIVITY)