Werk #13369: License usage: Fix invalid period error if exactly one year is entered

Component	User interface
Title	License usage: Fix invalid period error if exactly one year is entered
Date	Oct 1, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If you entered exactly one year for the subscription period, e.g. 01.10.2021 - 30.09.2021, the error "Invalid subscription period. Must be at least one year" was shown.

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