Fix isTypeOfExpression in compiler API (#20875). (#20884)

src/compiler/utilities.ts

@@ -4704,7 +4704,7 @@ namespace ts {
     }
 
     export function isTypeOfExpression(node: Node): node is TypeOfExpression {
-        return node.kind === SyntaxKind.AwaitExpression;
+        return node.kind === SyntaxKind.TypeOfExpression;
     }
 
     export function isVoidExpression(node: Node): node is VoidExpression {