Add OpenACC 'host_data' testing to 'gfortran.dg/goacc/unexpected-end.f90'

Use underscore instead of space in 'host_data'.

Follow-up to recent commit 33fdbbe4
"Fortran: Add missing ST_OMP_END_SCOPE handling [PR102313]".

	gcc/testsuite/
	* gfortran.dg/goacc/unexpected-end.f90: Add OpenACC 'host_data'
	testing.