Fix default scrollTo in Focused mode

[colvinco]

I noticed a regression when upgrading from 9.3.2, in focused mode previously the page would default scroll to the Overview when no # route is provided.

The getElementId changes for #852 meant that when no route is provided, the entire url would be returned, where previously an empty/undefined value would be used and hit:

RapiDoc/src/rapidoc.js

Lines 808 to 814 in 7f53d25

	} else if (this.renderStyle === 'focused') {
	// If goto-path is provided and no location-hash is present then try to scroll to default element
	if (!this.gotoPath) {
	const defaultElementId = this.showInfo ? 'overview' : this.resolvedSpec.tags[0]?.paths[0];
	this.scrollToPath(defaultElementId);
	}
	}

- which doesn't happen if the url is returned.