Change SNR kernel size to 9x9

[sophie22]

revert default kernel size to 9 when making the smoothing image for SNR calculation

TODO: in next version make optional CLI argument for kernel size, head coil - 9x9, body coil - 25x25

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
hazenlib
ACRObject.py	101	10	90%	59–61, 66–69, 107, 123–124
HazenTask.py	26	3	88%	32–34
__init__.py	50	11	78%	140, 171–173, 176–178, 190–192, 206
exceptions.py	21	5	76%	17–21, 38
utils.py	189	43	77%	61, 65, 75, 80, 117, 124–129, 140, 143–150, 170–172, 190–192, 211–213, 222, 227, 233, 284, 287, 295–300, 303, 346, 355, 371
hazenlib/tasks
acr_geometric_accuracy.py	121	64	47%	41–73, 121–146, 160–194
acr_ghosting.py	109	43	61%	34–49, 75–77, 107–109, 145–186
acr_slice_position.py	135	47	65%	46–61, 187–233
acr_slice_thickness.py	134	58	57%	34–48, 157–216
acr_snr.py	135	63	53%	43–83, 93, 163–173, 207–222, 255–272
acr_spatial_resolution.py	209	71	66%	58–83, 128, 171, 184–193, 275–326
acr_uniformity.py	83	33	60%	35–51, 108–133
ghosting.py	152	53	65%	18–35, 50, 112–113, 117, 127–128, 154–156, 173–175, 221–259
relaxometry.py	290	89	69%	207–208, 210, 221–224, 230–236, 265–309, 351, 385–403, 578, 624–626, 693, 767–789, 807–822
slice_position.py	117	23	80%	28, 37–38, 49, 103–104, 130, 210, 217–234
slice_width.py	360	53	85%	34–37, 41, 109, 168–188, 453, 458–459, 465, 470, 532–533, 782–823
snr.py	167	67	60%	51, 68–73, 170–188, 203–212, 230–240, 267–277, 282–292, 323–336, 341–349, 378–391
snr_map.py	104	1	99%	291
spatial_resolution.py	248	45	82%	36–39, 43, 64, 149, 208, 334–370
uniformity.py	79	20	75%	42–45, 51, 93–94, 101, 135–149
TOTAL	2855	802	72%

Tests	Skipped	Failures	Errors	Time
200	0 :zzz:	0 :x:	0 :fire:	3m 17s :stopwatch: