LibJS: Make ParserError::to_string infallible

Author: https://github.com/shannonbooth
Commit: 0090b916dd
Pull-request: https://github.com/SerenityOS/serenity/pull/23817
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibJS/Runtime/ShadowRealm.cpp

@@ -110,7 +110,7 @@ ThrowCompletionOr<Value> perform_shadow_realm_eval(VM& vm, StringView source_tex
     // b. If script is a List of errors, throw a SyntaxError exception.
     if (parser.has_errors()) {
         auto& error = parser.errors()[0];
-        return vm.throw_completion<SyntaxError>(TRY_OR_THROW_OOM(vm, error.to_string()));
+        return vm.throw_completion<SyntaxError>(error.to_string());
     }
 
     // c. If script Contains ScriptBody is false, return undefined.