Update mirador_viewer.xsl variable extref

  <!-- Ugly template for alpha tests-->

  <xsl:template match="ead:extref[contains(@xlink:href,'/manifest')]">

   <xsl:variable name="iiifLink">

      <xsl:value-of select="$baseuri"/>

      <xsl:value-of select="$project"/>

      <xsl:text>/mirador/?link=</xsl:text>

      <xsl:choose>

        <xsl:when test="contains(@xlink:href,'#')">

          <xsl:value-of select="substring-before(@xlink:href,'#')"/>

          <xsl:choose>

        <xsl:when test="@entityref='iiif_manifest'">

          <xsl:value-of select="$baseuri"/><xsl:value-of select="$project"/><xsl:text>/mirador/?link=</xsl:text><xsl:value-of select="@xlink:href"/><xsl:text>&amp;canvasId=&amp;canvasIndex=15</xsl:text>

            <xsl:when test="contains(@xlink:href,'#http')">

              <xsl:text>&amp;canvasId=</xsl:text>

              <xsl:value-of select="substring-after(@xlink:href,'#')"/>

              <xsl:text>&amp;canvasIndex=</xsl:text>

            </xsl:when>

            <xsl:otherwise>

          <xsl:value-of select="$baseuri"/><xsl:value-of select="$project"/><xsl:text>/mirador/?link=https</xsl:text><xsl:value-of select="substring-after(@xlink:href,'=http')"/><xsl:text>&amp;canvasId=&amp;canvasIndex=15</xsl:text>

              <xsl:text>&amp;canvasId=&amp;canvasIndex=</xsl:text>

              <xsl:value-of select="substring-after(@xlink:href,'#')"/>

            </xsl:otherwise>

          </xsl:choose>

        </xsl:when>

        <xsl:otherwise>

          <xsl:value-of select="@xlink:href"/>

          <xsl:text>&amp;canvasId=&amp;canvasIndex=</xsl:text>

        </xsl:otherwise>

      </xsl:choose>

    </xsl:variable>

    <span onclick="window.open('{$iiifLink}','Mirador Viewer','width=800,height=600,location=no')" class="mirador-link"><xsl:value-of select="."/></span>

  </xsl:template>