testsuite: Fix sed script errors in complex tests

I ran sed script late over the tests which accidentally
introduced a syntax error in the tests.

This fixes it.

Committed under the obvious rule.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/complex/complex-mla-template.c: Fix sed.
	* gcc.dg/vect/complex/complex-mls-template.c: Likewise.