Add systray_hide_by_icon_name Exact Match, Deliminator ','

Noticed that the tint2 command printed out the names of tray icons being added so I figured I'd just make it exact matches. I also noticed that programs like dropbox do not have a name in my distro (cbpp). So equal to blank will hide that. Equal to 0 or not having the whole line will disable it. The deliminator is a ",".

Seeing as the code isn't the way https://gitlab.com/o9000/tint2/issues/553 specified, I didn't bother to add it to tint2conf but it works great for me.