fix(typescript): no-semi for class props with modifiers

[ikatyang]

Fixes #5082

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Prettier pr-5083
Playground link

--parser typescript
--no-semi

Input:

const kBuffer = Symbol('buffer')
const kOffset = Symbol('offset')

class Reader {
  private [kBuffer]: Buffer // <-- here
  private [kOffset]: number
}

Output:

const kBuffer = Symbol("buffer")
const kOffset = Symbol("offset")

class Reader {
  private [kBuffer]: Buffer // <-- here
  private [kOffset]: number
}

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• I’ve added tests to confirm my change works.
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