Werk #11606: Fix downtime command when selecting "next year" as time range

Component	User interface
Title	Fix downtime command when selecting "next year" as time range
Date	Nov 10, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The error "ValueError (invalid literal for int() with base 10: 'next_year')" occured in 2.0.0i1 when selecting next year as time range.

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