Fixed build_pyramid test related to open_array_kwargs#904

jluethi merged 2 commits intofractal-analytics-platform:mainfractal-analytics-platform/fractal-tasks-core:mainfrom

m-albert:fix_build_pyramids_open_array_kwargs_testm-albert/fractal-tasks-core:fix_build_pyramids_open_array_kwargs_testCopy head branch name to clipboard