Fix d/watch intermediary file name

debian/watch

@@ -1,3 +1,3 @@
 version=3
-opts=dversionmangle=s/\+ds$//,repacksuffix=+ds,filenamemangle=s/.+\/v?(\d\S+)\.tar\.gz/<project>-$1\.tar\.gz/ \
+opts=dversionmangle=s/\+ds$//,repacksuffix=+ds,filenamemangle=s/.+\/v?(\d\S+)\.tar\.gz/stlink-$1\.tar\.gz/ \
   https://github.com/texane/stlink/tags .*/v?(\d\S+)\.tar\.gz