Revert "dap-server: Made the DAP2 ASCII response a 'returnAs' parameter for the DAP2 Data response."

This reverts commit 4711a4cf793021721e678143b045739fdf5e2e47.

This will provide a way to release an update of this module
that inclues the LARC patch but without the above fix so that the
old (hyrax 1.9 release) bes can still be used.
Updates for a bug fix release in the dap-server module only.