fix: simplify check for twitter import enabled

lib/assets/javascripts/builder/components/modals/add-layer/content/imports/import-options.js

@@ -134,7 +134,7 @@ module.exports = {
   },
   Twitter: {
     view: ImportTwitterView,
-    enabled: function (config, userModel) { return userModel.get('twitter').enabled && !!config.get('datasource_search_twitter'); },
+    enabled: function (_, userModel) { return userModel.get('twitter').enabled; },
     name: 'twitter',
     title: 'Twitter',
     type: 'other'

lib/assets/javascripts/builder/components/modals/add-layer/content/imports/imports-selector/imports-selector-model.js

@@ -86,11 +86,10 @@ module.exports = Backbone.Model.extend({
   },
 
   _isTwitterImportEnabled: function () {
-    if (!this._configModel.get('datasource_search_twitter') ||
-        !this._userModel.get('twitter').enabled ||
-        !this._userModel.canCreateTwitterDataset()) {
+    if (!this._userModel.get('twitter').enabled) {
       return false;
     }
+
     return true;
   },