[MINOR][DOCS] Remove unneeded production tag block method

[nchammas]

What changes were proposed in this pull request?

Remove an unneeded method override in the definition of ProductionTag.

Why are the changes needed?

It's just noise.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

I built the docs and confirmed that this script block shows up only when PRODUCTION=1:

spark/docs/_layouts/global.html

Lines 35 to 52 in 71468eb

	{% production %}
	<!-- Matomo -->
	<script>
	var _paq = window._paq = window._paq || [];
	/* tracker methods like "setCustomDimension" should be called before "trackPageView" */
	_paq.push(["disableCookies"]);
	_paq.push(['trackPageView']);
	_paq.push(['enableLinkTracking']);
	(function() {
	var u="https://analytics.apache.org/";
	_paq.push(['setTrackerUrl', u+'matomo.php']);
	_paq.push(['setSiteId', '40']);
	var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
	g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
	})();
	</script>
	<!-- End Matomo Code -->
	{% endproduction %}

Was this patch authored or co-authored using generative AI tooling?

No.

[HyukjinKwon]

Merged to master.