Move ui-select and its dependencies to global.js

Signed-off-by: Alex Coles <alex@alexbcoles.com>

frontend/app/global.js

@@ -61,3 +61,9 @@ require('Caret.js/src/jquery.caret.js');
 
 require('select2/select2.js');
 require('select2/select2.css');
+
+require('angular');
+require('angular-sanitize');
+
+require('ui-select/dist/select');
+require('ui-select/dist/select.css');

frontend/app/openproject-app.js

@@ -36,8 +36,6 @@ I18n.addTranslations = function(locale, translations) {
   I18n.translations[locale] = _.merge(I18n.translations[locale], translations);
 };
 
-
-var angular = require('angular');
 require('angular-animate');
 require('angular-aria');
 require('angular-modal');
@@ -52,16 +50,12 @@ require('angular-ui-select2');
 require('angular-ui-select2-sortable');
 
 require('angular-ui-date');
-require('angular-sanitize');
 require('angular-truncate');
 require('angular-feature-flags');
 
 require('angular-busy/dist/angular-busy');
 require('angular-busy/dist/angular-busy.css');
 
-require('ui-select/dist/select');
-require('ui-select/dist/select.css');
-
 require('angular-context-menu');
 require('mousetrap');