testsuite: Change gcc.dg/vect/pr56541.c target.

My last commit changed the target selector to
 ! vect_floatint_cvt
when it should of course be
 vect_floatint_cvt.

Fix this.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/pr56541.c: Fix target selector.
1 file changed