Make brush preset history limit configurable
Now the brush preset history docker can show more (or less) than 10 of the last used brushes.
As requested here: https://krita-artists.org/t/brush-preset-history-extending-amount-of-brushes-saved/49558
Test Plan
Using the input dialog added to the Brush Preset History docker's context menu, configure the number of brushes remembered:
- When the limit is raised, adding new brushes should fill the list until hitting the limit, then start removing the oldest ones.
- When the limit is lowered, the list should be truncated to fit the new limit.
Formalities Checklist
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