Make `exceptEmojis` optional when calling `init`

[Zertz]

import data from "@emoji-mart/data";
import { init } from "emoji-mart";

init({ data });

Before: TypeError: undefined is not an object (evaluating 'props.exceptEmojis.includes')

After: ✅

[EtienneLem]

Thanks! Made it not use optional chaining, just to make 1000000% sure we avoid trouble with some older Webpack versions.