Fix failing Darcy quasistatic ALE example

In cm commit f8c7deb616904a4338f8596b759b69b741c8f0d5, the time loop
while condition was fixed so that time loops only solved up until the
stop time, not past it.
This commit updates the loop end time to match the expected results.
Merge pull request #81 from adamreeve/darcy_fix

Fix failing Darcy quasistatic ALE example