Netsplits are not properly hidden when J/P/Q is toggled on

[phuzion]

When the "Hide J/P/Q" feature is turned on, netsplits are not properly hidden. Back in July, this was discovered by tmbg in #woboquassel on IRC, but apparently an issue was never raised here.

As @guruz mentioned, it's likely just a couple of messagetypes that need to be added to the logic of hiding JPQs. I believe I have found where these messagetypes need to go.

https://github.com/woboq/iquassel/blob/master/quassel-for-ios/quassel-for-ios/vcs/BufferViewController.m#L538-L544

It should just be a matter of adding the following to the code after line 541:

|| (message.messageType & MessageTypeNetsplitQuit))
|| (message.messageType & MessageTypeNetsplitJoin))