Fix bug regarding mentions with comma
Fix bug regarding mentions with comma

While tab-completing user names already respected the setting for
mentions with commas, right-clicking user names did not.

This commit adds the missing check in ChannelView::handleMouseClick.

hemirt/chatterino2,hemirt/chatterino2,Cranken/chatterino2,fourtf/chatterino2,fourtf/chatterino2,hemirt/chatterino2,Cranken/chatterino2,fourtf/chatterino2,hemirt/chatterino2,Cranken/chatterino2,Cranken/chatterino2