Update tests

tests/baselines/reference/covariantCallbacks.js

@@ -72,6 +72,7 @@ function f14(a: AList4, b: BList4) {
 
 
 //// [covariantCallbacks.js]
+"use strict";
 // Test that callback parameters are related covariantly
 ;
 function f1(a, b) {

tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts

@@ -1,4 +1,5 @@
 // @target: es2015
+// @strict: true
 
 // Test that callback parameters are related covariantly