fix(csharp/src/Drivers/Databricks): Fix Lz4 compression logic for DatabricksReader (#2690)

This PR
9ba6bdb
introduce a regression for DatabricksReader.
Fix it, also remove the unneeded constructor to prevent any misuse in
the future.

Author: eric-wang-1990

csharp/src/Drivers/Databricks/DatabricksConnection.cs

@@ -66,7 +66,7 @@ internal override IArrowArrayStream NewReader<T>(T statement, Schema schema, TGe
             }
             else
             {
-                return new DatabricksReader(databricksStatement, schema);
+                return new DatabricksReader(databricksStatement, schema, isLz4Compressed);
             }
         }
 

csharp/src/Drivers/Databricks/DatabricksReader.cs

@@ -34,11 +34,6 @@ internal sealed class DatabricksReader : IArrowArrayStream
         IArrowReader? reader;
         bool isLz4Compressed;
 
-        public DatabricksReader(DatabricksStatement statement, Schema schema)
-            : this(statement, schema, false)
-        {
-        }
-
         public DatabricksReader(DatabricksStatement statement, Schema schema, bool isLz4Compressed)
         {
             this.statement = statement;