This gives Quassel buffers sensible titles containing the name of the
network the buffer is currently displaying.
Ideally it would show me the name of the Quassel Core connection, but
this isn't exported from Quassel into the X window title.
The regex captures both the channel and the network, but only the
network is currently used for display - I may revisit that at some
point.
Change-Id: Ife4c06919d9e9c0114ff298e1443b2b27ce2f146
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1964
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>