Synaptics: remove useless delay.

As pointed by Axel and explained in Synaptic docs, the touchpad should
delay the first command itself until it's ready, so an arbitrary delay
should not be needed after reset.

Note: I don't have a touchpad on my machine. Please test this :)
BFilePanel: allow to change the node flavors

There doesn't seem to be anything ini the implementation that would
cause a problem, as long as you don't try to change this while the
window is already open.
FileTypes: disallow directories only where it makes sense.

Better fix for #8805.