Remove old identity cast

was only needed for TDS 5.0 and older.

Author: andyundso

ext/tiny_tds/client.c

@@ -433,11 +433,7 @@ static VALUE rb_tinytds_connect(VALUE self, VALUE opts) {
     }
     transposed_encoding = rb_funcall(cTinyTdsClient, intern_transpose_iconv_encoding, 1, charset);
     cwrap->encoding = rb_enc_find(StringValueCStr(transposed_encoding));
-    if (dbtds(cwrap->client) <= 7) {
-      cwrap->identity_insert_sql = "SELECT CAST(@@IDENTITY AS bigint) AS Ident";
-    } else {
-      cwrap->identity_insert_sql = "SELECT CAST(SCOPE_IDENTITY() AS bigint) AS Ident";
-    }
+    cwrap->identity_insert_sql = "SELECT CAST(SCOPE_IDENTITY() AS bigint) AS Ident";
   }
   return self;
 }