LPS-50429 - Migrate Asset Tags Navigation portlet aui-base javascript

Hi Rob,

Attached is an update for https://issues.liferay.com/browse/LPS-50429.

I couldn't find any circumstance where those showAssetCount and assetCountOptions nodes wouldn't exist, so I removed the check for them.  I squashed my changes into 4df3ee1.

Please let me know if there are any other issues.

Thanks!