fix(prejoin): Auto focus display name input

react/features/base/premeeting/components/web/InputField.js

 
 type Props = {
 
+    /**
+     * If the input should be focused on display.
+     */
+    autoFocus?: boolean,
+
     /**
      * Class name to be appended to the default class list.
      */
     render() {
         return (
             <input
+                autoFocus = { this.props.autoFocus }
                 className = { `field ${this.state.focused ? 'focused' : ''} ${this.props.className || ''}` }
                 data-testid = { this.props.testId ? this.props.testId : undefined }
                 onBlur = { this._onBlur }

react/features/prejoin/components/Prejoin.js

                     <div className = 'prejoin-input-area-container'>
                         <div className = 'prejoin-input-area'>
                             <InputField
+                                autoFocus = { true }
                                 onChange = { _setName }
                                 onSubmit = { joinConference }
                                 placeHolder = { t('dialog.enterDisplayName') }