Upgrade ESLint to version 4.x (#6276)

app/javascript/mastodon/features/ui/components/modal_root.js

@@ -113,13 +113,11 @@ export default class ModalRoot extends React.PureComponent {
         <div style={{ pointerEvents: visible ? 'auto' : 'none' }}>
           <div role='presentation' className='modal-root__overlay' onClick={onClose} />
           <div role='dialog' className='modal-root__container'>
-            {
-              visible ?
-                (<BundleContainer fetchComponent={MODAL_COMPONENTS[type]} loading={this.renderLoading(type)} error={this.renderError} renderDelay={200}>
-                  {(SpecificComponent) => <SpecificComponent {...props} onClose={onClose} />}
-                </BundleContainer>) :
-              null
-            }
+            {visible && (
+              <BundleContainer fetchComponent={MODAL_COMPONENTS[type]} loading={this.renderLoading(type)} error={this.renderError} renderDelay={200}>
+                {(SpecificComponent) => <SpecificComponent {...props} onClose={onClose} />}
+              </BundleContainer>
+            )}
           </div>
         </div>
       </div>