Take depths from first DC on CSV export

We need to limit the DCs from which we grab the depths. Otherwise, we
end up with too many depth values.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

xslt/xml2manualcsv.xslt

@@ -28,7 +28,7 @@
     <xsl:text>&quot;</xsl:text>
     <xsl:value-of select="@duration"/>
     <xsl:text>&quot;</xsl:text>
-    <xsl:apply-templates select="divecomputer/depth"/>
+    <xsl:apply-templates select="divecomputer[1]/depth"/>
     <xsl:choose>
       <xsl:when test="divetemperature/@air|divetemperature/@water != ''">
         <xsl:apply-templates select="divetemperature"/>