fix: respect lazyHtmlGeneration for consent modal

[Steve0x2a]

lazyHtmlGeneration is documented as delaying modal markup until a modal is about to become visible, but generateHtml always built the consent modal whenever consent was invalid. With autoShow: false that left an unused role="dialog" in the document.

Gate createConsentModal on lazyHtmlGeneration the same way as the preferences modal. show() still creates the consent modal when consent is invalid, so CookieConsent.show() continues to work.

Credits @okadriu for the report and the named generateHtml path.

Fixes #830

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