This matches i3's behavior of only focusing a container when pressed.
This allows for `bindsym button1 nop`, `bindsym BTN_LEFT nop`, or
`bindcode 272 nop` to be used to disable focusing when clicking on the
title (or with additional flags to bind{code,sym} other portions of
the container).
Without this additional condition, the user would need both
`bindsym button1 nop` and `bindsym --release button1 nop` to override
both the pressed and released behavior.