Add abstract/para in article.titlepage.recto.auto.mode

Reported by Meike.

In abstract/para there were no <p> tags in the output. Which lead to
a wall of text without linebreaks.

Solution was to introduce a rule that matches d:abstract/d:para in
mode article.titlepage.recto.auto.mode.

sbp/xhtml/titlepage.templates.xsl

@@ -78,6 +78,12 @@
  </xsl:template>
 
 
+ <xsl:template match="d:abstract/d:para" mode="article.titlepage.recto.auto.mode">
+ <p>
+ <xsl:apply-templates/>
+ </p>
+ </xsl:template>
+
  <xsl:template match="d:author[d:personname]|d:editor[d:personname]|d:othercredit[d:personname]" mode="authorgroup">
  <xsl:param name="withlabel" select="1"/>
 <!--<xsl:message>d:<xsl:value-of select="local-name(.)"/>[d:personname]</xsl:message> -->