This fixes a typo in handling of printers options in actualize_printers_list()
which caused a crash when number of printers exceeded number of options (#672689).
The existing code prevents the user from adding the existing default device
profile to the device again, but to prevent a warning message we need to prevent
the user from selecting *any* of the profiles already assigned to the device.
Reverts part of 109b369199
Good idea in principle, albeit the hardware gets in our way. In
synaptics 1.4 two-finger emulation was enabled by default on devices
that reported finger width but had to since revert this. The hardware
doesn't really separate width and pressure, so a hard tap off a finger
gives a high width, a wide finger gives a high pressure on light
touches. We got spurious right-click presses when two-finger
emulation was enabled.
Now we have the control-center providing a checkbox for two-finger
emulation but it doesn't enable emulation, which to the users appears as if
two-finger scrolling is broken
(https://bugzilla.redhat.com/show_bug.cgi?id=738123).
We now disable the checkbox again for hardware that doesn't do two-fingers.
it's not reliable and we're likely to see further bugs when the spurious right
clicks take effect
https://bugzilla.gnome.org/show_bug.cgi?id=661963
time_t might be a 32-bit integer, which wouldn't be big enough
to contain the number of microseconds since Epoch (since it can
only fit the number of seconds from Epoch until 2038).
https://bugzilla.redhat.com/show_bug.cgi?id=795792
