[MM-56266] Use ListTeamChannels for member count permission for public channels (#26820)

server/channels/api4/channel.go

@@ -732,8 +732,8 @@ func getChannelsMemberCount(c *Context, w http.ResponseWriter, r *http.Request)
 	}
 
 	for _, channel := range channels {
-		if !c.App.HasPermissionToReadChannel(c.AppContext, c.AppContext.Session().UserId, channel) {
-			c.SetPermissionError(model.PermissionReadChannel)
+		if !c.App.HasPermissionToChannelMemberCount(c.AppContext, c.AppContext.Session().UserId, channel) {
+			c.SetPermissionError(model.PermissionListTeamChannels)
 			return
 		}
 	}