Standardize resolve helper lookup

Author: etimberg

src/core/core.scale.js

@@ -3,12 +3,11 @@
 var defaults = require('./core.defaults');
 var Element = require('./core.element');
 var helpers = require('../helpers/index');
-const optionHelpers = require('../helpers/helpers.options');
 var Ticks = require('./core.ticks');
 
 var isArray = helpers.isArray;
 var isNullOrUndef = helpers.isNullOrUndef;
-const resolve = optionHelpers.resolve;
+const resolve = helpers.options.resolve;
 var valueOrDefault = helpers.valueOrDefault;
 
 defaults._set('scale', {