Add author info onto PDF cover for normal maps #1677

[Fixtures](https://github.com/eerohele/dita-ot-issues/tree/master/fixtures/1677).

I'm not sure the `<xsl:template match="*[contains(@class, ' map/topicmeta ')][not(parent::opentopic:map)]">` template is actually 100% necessary, but I suppose it's a bit easier to add processing for `<topicmeta>` elements that aren't children of `<map>` if it's there since you can theoretically just do something like `<xsl:apply-templates select="$whatever/*[contains(@class, ' map/topicmeta ')]"/>` and have some kind of default processing.