Repair worker: log debug instead of bare pass on active-server lookup

Ruff S110 (try-except-pass) on the lookup inside
`_build_unresolvable_album_folder_error`. Swallowed exception is benign
(some test stubs don't expose `get_active_media_server` and we fall
back to 'unknown'), but ruff is right that bare pass is a smell.
Logger is the existing repair_worker logger, so this matches the same
"debug-log on optional-input failure" pattern used in
`core/library/path_resolver.py:_collect_base_dirs`.

core/repair_worker.py

@@ -1949,8 +1949,8 @@ class RepairWorker:
                     active_server = getter() or 'unknown'
                 else:
                     active_server = self._config_manager.get('active_media_server', 'unknown') or 'unknown'
-            except Exception:
-                pass
+            except Exception as e:
+                logger.debug("active media server lookup failed: %s", e)
 
         lines = [
             "Could not find any existing track from this album on disk.",