Bug 37354: (QA follow-up) Reset periodPicker on rule change
This patch clears the periodPicker values when the applied circulation
rules change. This prevents selection of one booking period against one
set of rules and then a change of item to an itemtype where different
rules should apply but the old selected period remaining and thus 'rule
breaking' being allowed.
Signed-off-by: Nick Clemens <nick@bywatersolutions.com> Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>