Add missing ',' in default jdwp argument list

We were incorrectly missing a ',' in the default jdwp argument list.
This meant that a manual -XjdwpProvider:adbconnection will fail due to
failing to parse the argument string.

Test: run app with wrap.sh that adds  '-XjdwpProvider:adbconnection -Xcompiler-option --debuggable'
      Attach debugger
Bug: 109505014

Change-Id: Id09e04cd92c2f89a4bcdf95b05071bacd509b286