Remove @optional from outcome printer test.

Author: cristianoc

tests/oprint/expected/oprint.resi.txt

@@ -486,5 +486,4 @@ type emptyObject = {.}
 let f: (~x: 'a=?, ~y: 'b) => option<'a>
 type call = CleanStart
 let f: (~a: int=?, unit) => int
-type opt0 = {x: int, ?y: string}
 type opt = {x: int, ?y: string}

tests/oprint/oprint.res

@@ -360,6 +360,4 @@ type call = CleanStart
 
 let f = (~a=1, ()) => 1
 
-type opt0 = {x:int, @optional y: option<string>}
-
 type opt = {x:int, @ns.optional y: option<string>}