[TypeScript] inline method decorators should stay inlined

[ikatyang]

Originally reported by @svipben in #5360 (comment)

Prettier 1.15.2
Playground link

--parser typescript

Input:

class X {
  @deco x() {
    return this.count * 2;
  }
  @deco get x() {
    return this.count * 2;
  }
}

Output:

class X {
  @deco
  x() {
    return this.count * 2;
  }
  @deco
  get x() {
    return this.count * 2;
  }
}

Expected behavior:
Same as input.

[svipas]

@ikatyang I created an issue #5445 so I'm closing it and I will add a reference to this issue.

[ikatyang]

Ah, sorry! I thought you're away from the computer.

[svipas]

@ikatyang No problem, your examples are way shorter and better. Also, you're very fast, you opened an issue and already fixed it 😄 Thank you very much, I'm very happy 😄