Fix block editor example in storybook #25976
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Description
Fixes #25975
This is a tiny fix for the
useIsFontSizeDisabledhook, which didn't handlefontSizesbeingundefined. Also coerces the value to a boolean, as the function is documented to return values of that type.The missing logic was causing the standalone block editor in the storybook to error as it doesn't have
fontSizes.How has this been tested?
npm run storybook:devTypes of changes
Bug fix (non-breaking change which fixes an issue)
Checklist: