[html specs] Use correct location of draft image
<xsl:if test="$book.status = 'draft'">
<style>
<xsl:text><![CDATA[#scrollable {
- background: transparent url(../images/]]></xsl:text><xsl:value-of select="$draft.watermark.image"/><xsl:text><![CDATA[) repeat-y center top;
+ background: transparent url(images/]]></xsl:text><xsl:value-of select="$draft.watermark.image"/><xsl:text><![CDATA[) repeat-y center top;
background-attachment: local;
will-change: transform;
}]]></xsl:text>
