Fix base font size display in settings

[akshay-gupta7]

• When a user changes the base font size from settings, either directly or via a font size token, the rem value will now be displayed in the settings with the current base font size(Default being 1 rem)

Closes #2845

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Latest commit: 8a96fcbb5e2043d894fcf64593a231af15de1796

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