gprofng: fix bug 29353 - Fix a lay-out issue in the html disassembly files

gprofng/Changelog:
2022-07-22  Ruud van der Pas  <ruud.vanderpas@oracle.com>

	PR gprofng/29353
	* gp-display-html/gp-display-html.in: fixed a problem in the
	generation of html for the disassembly where instructions
	without arguments were not handled correctly.