Removed unused string classes in components

• Removed:
- unused string classes in components

app/javascript/gabsocial/components/modal/embed_modal.js

@@ -64,7 +64,6 @@ class EmbedModal extends ImmutablePureComponent {
             <Input
               readOnly
               type='text'
-              className='embed-modal__html'
               value={oembed && oembed.html || ''}
               onClick={this.handleTextareaClick}
             />

app/javascript/gabsocial/components/popover/date_picker_popover.js

@@ -43,7 +43,6 @@ class DatePickerPopover extends React.PureComponent {
           <DatePicker
             inline
             target={this}
-            className='schedule-post-dropdown__datepicker'
             minDate={new Date()}
             selected={date}
             onChange={date => this.handleSetDate(date)}