Remove userOwnsProject because it is unused

src/views/preview/presentation.jsx

@@ -114,7 +114,6 @@ const PreviewPresentation = ({
     showAdminPanel,
     showModInfo,
     singleCommentId,
-    userOwnsProject,
     visibilityInfo
 }) => {
     const shareDate = ((projectInfo.history && projectInfo.history.shared)) ? projectInfo.history.shared : '';
@@ -654,7 +653,6 @@ PreviewPresentation.propTypes = {
     showAdminPanel: PropTypes.bool,
     showModInfo: PropTypes.bool,
     singleCommentId: PropTypes.oneOfType([PropTypes.number, PropTypes.bool]),
-    userOwnsProject: PropTypes.bool,
     visibilityInfo: PropTypes.shape({
         censored: PropTypes.bool,
         message: PropTypes.string,

src/views/preview/project-view.jsx

@@ -579,7 +579,6 @@ class Preview extends React.Component {
                         showAdminPanel={this.props.isAdmin}
                         showModInfo={this.props.isAdmin}
                         singleCommentId={this.state.singleCommentId}
-                        userOwnsProject={this.props.userOwnsProject}
                         visibilityInfo={this.props.visibilityInfo}
                         onAddComment={this.handleAddComment}
                         onAddToStudioClicked={this.handleAddToStudioClick}