Remove max select for multiple assignees

app/views/shared/issuable/_sidebar_assignees.html.haml

@@ -42,7 +42,6 @@
     - options[:data][:multi_select] = true
     - options[:data]['dropdown-title'] = title
     - options[:data]['dropdown-header'] = 'Assignee'
-    - options[:data]['max-select'] = 1
   - else
     - title = 'Select assignee'
 

spec/javascripts/multiple_assignees/sidebar_spec.js

+describe('Sidebar', () => {
+  preloadFixtures('issues/open-issue.html.raw');
+
+  beforeEach(() => loadFixtures('issues/open-issue.html.raw'));
+
+  it('does not have a max select', () => {
+    const dropdown = document.querySelector('.js-author-search');
+
+    expect(dropdown.dataset.maxSelect).toBeUndefined();
+  });
+});