Unwanted removal of parenthesis around pack parameters in Luau

[littensy]

The formatter removes parenthesis around pack parameters that contain only one type, which can cause an error with linters: Type parameters must come before type pack parameters

For example, if you set up the following code:

type SomeType<T..., U...> = (T...) -> U...
local fn: SomeType<(string, number), (boolean)>

StyLua will format it to this:

type SomeType<T..., U...> = (T...) -> U...
local fn: SomeType<(string, number), boolean>

Without the parenthesis around pack parameters, the type of fn will incorrectly resolve to (string, number) -> () in this case with Luau LSP.