Fix naming of MyPaint brushes on versioned serialization
Before this commit, versioned .myb files would apply the .kpp suffix, only to be overridden by the save preset dialog. CCBUG: 439817 BUG: 445281 BUG: 445282
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Before this commit, versioned .myb files would apply the .kpp suffix, only to be overridden by the save preset dialog. CCBUG: 439817 BUG: 445281 BUG: 445282
mentioned in commit a4f84ca9