Fix heredoc EOF marker in plex-metrics script

The EOF marker was on the same line as the library_metrics variable,
causing the heredoc to not close properly.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/roles/plex_metrics/templates/plex-metrics.sh.j2

@@ -159,7 +159,8 @@ plex_transcode_audio_sessions ${plex_transcode_audio}
 
 # HELP plex_library_items Number of items in each Plex library
 # TYPE plex_library_items gauge
-${library_metrics}EOF
+${library_metrics}
+EOF
 
 # Atomic move
 mv "$TEMP_FILE" "$OUTPUT_FILE"