[Commotion-admin] [luci-commotion] fix validation function for app settings expiration time field (#442)

[Dan Staples]

Not sure how we didn't catch this in 1.1 testing. It effectively prevents users from changing any settings in the applications portal.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion/pull/442#issuecomment-63080679
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