Parentheses incorrectly removed by printer, leading to wrong application of `@uncurry`

[cknitt]

Example from rescript-webapi:

@val external queueMicrotask: (@uncurry (unit => unit)) => unit = "queueMicrotask"

is reformatted to

@val external queueMicrotask: (@uncurry unit => unit) => unit = "queueMicrotask"

which applies @uncurry incorrectly (giving an "unused attribute" warning in v12/master after I fixed the unused attribute checks in #6643).

[cknitt]

(in uncurried mode only)

[shulhi]

This is similar to #6638

[zth]

Should we close this @cknitt ? Everything should be uncurried in v12, right?

[cknitt]

I just retested, and it turns out this behavior is already fixed since 12.0.0-alpha.4. 🎉