ctf: Fix slow test due to expected timeout

ctf: Fix slow test due to expected timeout

The test was looking for a possible checkbox (in 4.6) but when it
it was not there (4.5) it had to wait 50 secs for it to time out.
Instead we can set a very short timeout because it will instantly
either be there or not.

Change-Id: I05acf8844619377362accd32af7d994e050d5ec6
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/65747
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Hudson CI