Nowhere else does this (write a setting if it’s not set).
It took me a while to see that this code does not do what it intends,
because `defaultFormat` is already the default value in the first
`context.getString`, so calling `getMediaFormatFromKey` again is the
exact same call (“do you know the definition of insanity…”) and will
return `null` again …
So let’s drop the setting write and just rely on the default values.
575e809004