Fix missing get_db_connection import in queue_manager (silent NameError causes wrongful blacklisting)

[Ele-CO]

Problem

queues/queue_manager.py calls get_db_connection() in the new-item ghostlist/blacklist pre-check (around line 1115), but get_db_connection is never imported at module level (nor locally in that function).

if imdb_id or tmdb_id:
    conn_check = None
    try:
        conn_check = get_db_connection()   # NameError: name 'get_db_connection' is not defined
        ...

Because the call is inside a try/except, the resulting NameError is swallowed. The pre-check silently fails, which can lead to items being wrongly blacklisted instead of falling back to a 1080p result. The symptom is hard to spot because there's no visible error.

Fix

Add the missing module-level import, matching the existing import style already used throughout the codebase (e.g. database/database_reading.py, database/database_writing.py both do from database.core import get_db_connection).

+from database.core import get_db_connection
 from database.database_writing import update_media_item_state, add_media_item
 from database.database_reading import get_media_item_by_id, get_item_count_by_state
 from database.collected_items import add_to_collected_notifications

This is a one-line, behavior-correcting change. No other logic is touched.

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