Minor fixes for `calculate_registration_image_based`

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)
fractal_tasks_core/tasks
calculate_registration_image_based.py	$This PR doesn't change the number of statements in fractal_tasks_core/tasks/calculate_registration_image_based.py, which is 84.$	$This PR removes 1 from the number of statements missing coverage in fractal_tasks_core/tasks/calculate_registration_image_based.py, taking it from 7 to 6.$	$This PR adds 1.19 percentage points to the coverage rate in fractal_tasks_core/tasks/calculate_registration_image_based.py, taking it from 91.66% (77/84) to 92.85% (78/84).$	$In this PR, 2 new statements are added to fractal_tasks_core/tasks/calculate_registration_image_based.py, 2 of which are covered (100%).$
Project Total