test: remove string literal message in assertions

Remove string literal message in assert.strictEqual() calls in
test-async-await.js.
Backport-PR-URL: #22912
PR-URL: #22849
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Trott

test/async-hooks/test-async-await.js

@@ -64,15 +64,15 @@ const timeout = common.platformTimeout(10);
 
 functioncheckPromisesInitState(){
 for(constinitStateofpromisesInitState.values()){
-assert.strictEqual(initState,'resolved',
-'promise initialized without being resolved');
+// Promise should not be initialized without being resolved.
+assert.strictEqual(initState,'resolved');
 }
 }
 
 functioncheckPromisesExecutionState(){
 for(constexecutionStateofpromisesExecutionState.values()){
-assert.strictEqual(executionState,'after',
-'mismatch between before and after hook calls');
+// Check for mismatch between before and after hook calls.
+assert.strictEqual(executionState,'after');
 }
 }