Disable default sorting on MSSQL results

When printing output using the `mssql_print_reply`, the output gets
sorted by default by the first column. This can distort the output,
especially when the row order is crucial like in case of executing
external commands with `mssql_xpcmdshell`.

This patch disables sorting by initializing Rex::Ui::Text::Table
with SortIndex = -1.
Land #2339 - Set SortIndex