Address @ts-expect-error

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There is 1 @ts-expect-error that's a tricky to address, in SandwichesScreenView.ts. I suspect that it may go away during PhET-iO instrumentation #78, because it's related to something that needs to be converted from dynamic to static instantiation. I'll leave this issue open, and circle back later.

When this @ts-expect-error has been removed, then this change needs to be made to package.json:

        "rules": {
-         "@typescript-eslint/no-explicit-any": "error"
+         "@typescript-eslint/no-explicit-any": "error",
+         "@typescript-eslint/ban-ts-comment": "error"
        }

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Addressed in the above commit, and updated package.json. Closing.