Converting preview image modal to use react-bootstrap. Fixes issue where modal would appear behind background on iOS

web/react/components/rhs_comment.jsx

@@ -163,7 +163,6 @@ export default class RhsComment extends React.Component {
             fileAttachment = (
                 <FileAttachmentList
                     filenames={post.filenames}
-                    modalId={'rhs_comment_view_image_modal_' + post.id}
                     channelId={post.channel_id}
                     userId={post.user_id}
                 />