gprofng: fix bug 29356 - Execution fails if gprofng is not included in PATH

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

	PR gprofng/29356
	* gp-display-html/gp-display-html.in: fixed a problem to execute
	gp-display-text in case gprofng is not included in the search
	path.