Fix Multibrush Tool crash
Initialize tool configGroup before optionWidget, otherwise KisToolMultihand::createOptionWidget will crash.
Test Plan
Try to use the Multibrush tool.
Formalities Checklist
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I confirmed this builds. -
I confirmed Krita ran and the relevant functions work. -
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I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.
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