Fix "Error loading the shares list TypeError: "this is undefined"" for conversation shares

Signed-off-by: Joas Schilling <coding@schilljs.com>

apps/files_sharing/src/utils/SharedWithMe.js

@@ -50,7 +50,7 @@ const shareWithTitle = function(share) {
 			{ escape: false }
 		)
 	} else if (share.type === OC.Share.SHARE_TYPE_ROOM) {
-		if (this.model.get('reshare').share_with_displayname) {
+		if (share.shareWithDisplayName) {
 			return t(
 				'files_sharing',
 				'Shared with you and the conversation {conversation} by {owner}',