fix missing closing tag </gpx> for cases without trk

Author: karussell

src/sidebar/RoutingResults.tsx

@@ -683,9 +683,11 @@ function downloadGPX(path: Path, settings: Settings) {
             trackPoint += '</trkpt>\n'
             return prevString + trackPoint
         }, '')
-        xmlString += '</trkseg></trk>\n</gpx>'
+        xmlString += '</trkseg></trk>\n'
     }
 
+    xmlString += '</gpx>'
+
     const tmpElement = document.createElement('a')
     const file = new Blob([xmlString], { type: 'application/gpx+xml' })
     tmpElement.href = URL.createObjectURL(file)