Fix quoted record labels

[jvliwanag]

Fixing cases for code generation of:

type Foo = ( "Bar" :: Int )

and

type Foo = { "Bar" :: Int }

I did check the purescript-cst from the compiler that Bar in both instances are read as (Label "Bar") (and not (Label "\"Bar\")) - so we'll need to add in quoting for that.

I'm not too familiar with the purescript cst syntax definition from the cst's Parser.y file though -- so the code for the check whether the label needs quoting though is a guess -- let me know if I should adjust accordingly.

Also, unsure if I placed the code in the correct places -- let me know if I should move them elsewhere.

[srghma]

I think everything is fine

the same fix can be added for record accessors xxx."Asdf", but we dont have tests, so ok