[FIX] MessageBox mention shouldn't show group DMs (#2049)

* fixed-issue

* [FIX] Filter users only if it's not a group chat

Co-authored-by: Djorkaeff Alexandre <djorkaeff.unb@gmail.com>
Co-authored-by: Diego Mello <diegolmello@gmail.com>

app/lib/rocketchat.js

@@ -573,9 +573,9 @@ const RocketChat = {
 		).fetch();
 
 		if (filterUsers && !filterRooms) {
-			data = data.filter(item => item.t === 'd');
+			data = data.filter(item => item.t === 'd' && !RocketChat.isGroupChat(item));
 		} else if (!filterUsers && filterRooms) {
-			data = data.filter(item => item.t !== 'd');
+			data = data.filter(item => item.t !== 'd' || RocketChat.isGroupChat(item));
 		}
 		data = data.slice(0, 7);