Remove regenerator edge case from selfContained test

Right now exporting a generator doesn't work because we hoist the
export assignment before the function expression assignment.  This
will be dealt with at another time as it is not specific to this
transformer.

test/fixtures/transformation/optional-self-contained/full/actual.js

@@ -1,6 +1,6 @@
 import foo, * as bar from "someModule";
 
 export const myWord = Symbol("abc");
-export function* giveWord () {
+function* giveWord () {
   yield myWord;
 }

test/fixtures/transformation/optional-self-contained/full/expected.js

@@ -19,7 +19,6 @@ var giveWord = _regeneratorRuntime.mark(function giveWord() {
   }, giveWord, this);
 });
 
-exports.giveWord = giveWord;
 var foo = _to5Runtime.interopRequire(require("someModule"));
 
 var bar = _to5Runtime.interopRequireWildcard(require("someModule"));