fix: inverse semaphore count check

Inverse the semaphore count check when waiting for a TMDB entity to be unlocked. In it's reversed state it will effectively skip the wait instead of waiting if the entity is locked, meaning it's doing the opposite of what we want.

Shoko.Server/Providers/TMDB/TmdbMetadataService.cs

@@ -2517,7 +2517,7 @@ private bool UpdateMovieExternalIDs(TMDB_Movie movie, ExternalIdsMovie externalI
     private bool WaitIfEntityLocked(ForeignEntityType entityType, int id, string metadataKey)
     {
         var key = $"{entityType.ToString().ToLowerInvariant()}-{metadataKey}:{id}";
-        if (!_concurrencyGuards.TryGetValue(key, out var semaphore) || semaphore.CurrentCount == 0)
+        if (!_concurrencyGuards.TryGetValue(key, out var semaphore) || semaphore.CurrentCount != 0)
             return false;
 
         semaphore.Wait();
@@ -2530,7 +2530,7 @@ private Task<bool> WaitIfEntityLockedAsync(ForeignEntityType entityType, int id,
     {
         var startedAt = DateTime.Now;
         var key = $"{entityType.ToString().ToLowerInvariant()}-{metadataKey}:{id}";
-        if (!_concurrencyGuards.TryGetValue(key, out var semaphore) || semaphore.CurrentCount == 0)
+        if (!_concurrencyGuards.TryGetValue(key, out var semaphore) || semaphore.CurrentCount != 0)
             return Task.FromResult(false);
 
         return semaphore.WaitAsync().ContinueWith(t =>