Fix eslint no-unreachable in ES5

[MAILPOET-1085]

.eslintrc.es5.json

@@ -37,7 +37,6 @@
     "computed-property-spacing": 0,
     "no-plusplus": 0,
     "array-bracket-spacing": 0,
-    "no-unreachable": 0,
     "default-case": 0,
     "no-lonely-if": 0,
     "space-before-blocks": 0,

assets/js/src/modal.js

@@ -114,7 +114,6 @@ define('modal', ['mailpoet', 'jquery'],
         } else {
           return window.Handlebars.compile(template);
         }
-        return false;
       },
       init: function(options) {
         if(this.initialized === true) {