fix: Fix bug in save label colors between sessions

[Czaki]

No description provided.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.02%.

Quality metrics	Before	After	Change
Complexity	2.07 ⭐	2.07 ⭐	0.00
Method Length	43.29 ⭐	43.44 ⭐	0.15 👎
Working memory	5.86 ⭐	5.86 ⭐	0.00
Quality	80.18% ⭐	80.20% ⭐	0.02% 👍

Other metrics	Before	After	Change
Lines	1099	1113	14

Changed files	Quality Before	Quality After	Quality Change
package/PartSeg/common_gui/colormap_creator.py	76.26% ⭐	76.16% ⭐	-0.10% 👎
package/PartSegCore/utils.py	81.99% ⭐	81.95% ⭐	-0.04% 👎
package/tests/test_PartSegCore/test_utils.py	84.02% ⭐	84.16% ⭐	0.14% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
package/PartSeg/common_gui/colormap_creator.py	ColormapList.refresh	8 ⭐	204 😞	13 😞	45.06% 😞	Try splitting into smaller methods. Extract out complex expressions
package/PartSeg/common_gui/colormap_creator.py	ChannelPreview.__init__	5 ⭐	252 ⛔	12 😞	46.58% 😞	Try splitting into smaller methods. Extract out complex expressions
package/PartSeg/common_gui/colormap_creator.py	ColormapCreator.__init__	0 ⭐	181 😞	11 😞	58.05% 🙂	Try splitting into smaller methods. Extract out complex expressions
package/PartSegCore/utils.py	numpy_repr	2 ⭐	46 ⭐	12 😞	71.50% 🙂	Extract out complex expressions
package/tests/test_PartSegCore/test_utils.py	TestProfileDict.test_update	0 ⭐	140 😞	6 ⭐	73.09% 🙂	Try splitting into smaller methods

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