testsuite: Don't expect a complex FMA

The sharing of the COMPLEX_MUL node makes it so it's
more efficient to not generate both a MUL and FMA
in this node.

Because the shape for a normal FMA is not different
the FMA is no longer detected here which results in
better codegen so update the testcase.

gcc/testsuite/ChangeLog:

	* g++.dg/vect/pr99149.cc: Update case.

gcc/testsuite/g++.dg/vect/pr99149.cc

@@ -25,4 +25,3 @@ public:
 main() { n.j(); }
 
 /* { dg-final { scan-tree-dump-times "stmt.*COMPLEX_MUL" 1 "slp2" } } */
-/* { dg-final { scan-tree-dump-times "stmt.*COMPLEX_FMA" 1 "slp2" } } */