fix(sharing): clean old federation shares when select another file/folder

Signed-off-by: Luka Trovic <luka@nextcloud.com>

Author: luka-nextcloud

apps/files_sharing/src/views/SharingTab.vue

@@ -429,6 +429,7 @@ export default {
 		 * @param {object} share.data the request data
 		 */
 		processShares({ data }) {
+			this.externalShares = []
 			if (data.ocs && data.ocs.data && data.ocs.data.length > 0) {
 				const shares = orderBy(
 					data.ocs.data.map((share) => new Share(share)),