Fix eslint rules

[MAILPOET-1348]

assets/js/src/newsletters/send/standard.jsx

@@ -1,19 +1,8 @@
-define(
-  [
-    'react',
-    'jquery',
-    'underscore',
-    'mailpoet',
-    'wp-js-hooks',
-  ],
-  (
-    React,
-    jq,
-    _,
-    MailPoet,
-    Hooks
-  ) => {
-    const jQuery = jq;
+import React from 'react';
+import jQuery from 'jquery';
+import _ from 'underscore';
+import MailPoet from 'mailpoet';
+import Hooks from 'wp-js-hooks';
 
 const currentTime = window.mailpoet_current_time || '00:00';
 const defaultDateTime = `${window.mailpoet_current_date} 00:00:00`;
@@ -156,7 +145,7 @@ define(
         size="10"
         name={this.getFieldName()}
         value={this.getDisplayDate(this.props.value)}
-            readOnly={true}
+        readOnly
         disabled={this.props.disabled}
         onChange={this.onChange}
         ref={(c) => { this.dateInput = c; }}
@@ -169,9 +158,9 @@ define(
 const TimeSelect = React.createClass({
   render: function render() {
     const options = Object.keys(timeOfDayItems).map(
-          (value, index) => (
+      value => (
         <option
-              key={`option-${index}`}
+          key={`option-${timeOfDayItems[value]}`}
           value={value}
         >
           { timeOfDayItems[value] }
@@ -418,7 +407,7 @@ define(
 
 fields = Hooks.applyFilters('mailpoet_newsletters_3rd_step_fields', fields);
 
-    return {
+module.exports = {
   getFields: function getFields() {
     return fields;
   },
@@ -443,5 +432,3 @@ define(
     return options;
   },
 };
-  }
-);