use constant.builtin.boolean scope for ecma boolean (#14357)

Author: dangh

runtime/queries/ecma/highlights.scm

@@ -222,12 +222,15 @@
 (super) @variable.builtin
 
 [
-  (true)
-  (false)
   (null)
   (undefined)
 ] @constant.builtin
 
+[
+  (true)
+  (false)
+] @constant.builtin.boolean
+
 (comment) @comment
 
 [