Choosing the right query when selecting. Issue dotnet/extensions#1268

\n\nCommit migrated from dotnet/extensions@4bead49

Author: MarkCBB

src/Caching/SqlServer/src/MonoDatabaseOperations.cs

@@ -80,7 +80,7 @@ protected override byte[] GetCacheItem(string key, bool includeValue)
             byte[] value = null;
             using (var connection = new SqlConnection(ConnectionString))
             {
-                var command = new SqlCommand(SqlQueries.GetCacheItem, connection);
+                var command = new SqlCommand(query, connection);
                 command.Parameters
                     .AddCacheItemId(key)
                     .AddWithValue("UtcNow", SqlDbType.DateTime, utcNow.UtcDateTime);