[tests] fix wonky test

tests/unit/src/unit/issues/Issue9904.hx

@@ -2,7 +2,6 @@ package unit.issues;
 
 class Issue9904 extends unit.Test {
 	function test() {
-		f(Std.parseFloat("a") == null);
 		t(Math.isNaN(Std.parseFloat("a")));
 	}
 }