Revert "Fix step values for susceptibility slider (#76)" #201

Job	Run time
Ex1 (3.8, ubuntu-latest, tests/test_dcip.py)	1h 11m 53s
Ex1 (3.8, ubuntu-latest, tests/test_em.py)	2h 57m 34s
Ex1 (3.8, ubuntu-latest, tests/test_gpr.py tests/test_seismic.py)	4h 6m 14s
Ex1 (3.8, ubuntu-latest, tests/test_inversion.py)	1h 11m 1s
Ex1 (3.8, ubuntu-latest, tests/test_gravity.py tests/test_mag.py)	36m 22s
Ex1 (3.10, ubuntu-latest, tests/test_dcip.py)	36m 59s
Ex1 (3.10, ubuntu-latest, tests/test_em.py)	2h 22m 26s
Ex1 (3.10, ubuntu-latest, tests/test_gpr.py tests/test_seismic.py)	4h 6m 20s
Ex1 (3.10, ubuntu-latest, tests/test_inversion.py)	1m 14s
Ex1 (3.10, ubuntu-latest, tests/test_gravity.py tests/test_mag.py)	36m 17s
	17h 46m 20s

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