web: Show a more specific error when reference types are unsupported #18838
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This is somewhat the antithesis of #18528. That PR keeps Ruffle running on browsers without reference types support. This instead shows a better error on those browsers.
Merging #18399 will break Ruffle on Safari versions below 15 and Pale Moon. We can keep Ruffle working on those browsers, or we can officially designate them to be unsupported.