Use new grammar API for reserved words

Co-authored-by: Amaan <[email protected]>

Author: maxbrunsfeld

grammar.js

@@ -31,7 +31,7 @@ module.exports = grammar({
   ],
 
   reserved: {
-    global: [
+    global: $ => [
       'const',
       'do',
       'else',
@@ -45,7 +45,7 @@ module.exports = grammar({
       'var',
       'while',
     ],
-    properties: [],
+    properties: $ => [],
   },
 
   supertypes: $ => [
@@ -1217,7 +1217,7 @@ module.exports = grammar({
       field('value', choice($.pattern, $.assignment_pattern)),
     ),
 
-    _property_name: $ => reserved([], choice(
+    _property_name: $ => reserved('properties', choice(
       alias(choice(
         $.identifier,
         $._reserved_identifier