Werk #15711: Fix execution of local gadgets

Component	NagVis
Title	Fix execution of local gadgets
Date	Oct 2, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0p11 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p34 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Gadgets located in the local hierarchy of the site (at local/share/nagvis/htdocs/userfiles/gadgets) could not be used and resulted in "Forbidden" errors when trying to open them.

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