x11/tint: 0.12.6 -> 0.12.7

Changes:

https://gitlab.com/o9000/tint2/blob/0.12.7/ChangeLog

• Fix crash caused by race when reading inconsistent values for _NET_CURRENT_DESKTOP and _NET_NUMBER_OF_DESKTOPS
• Fix regression (all desktop tasks not working)
• Fix small memory leak in launcher

PR: 208112
Submitted by: yamagi@yamagi.org (maintainer)