Fix chmod in download_samples.sh (openPMD#1518)

The last entries are invalid.

share/openPMD/download_samples.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 #
+set -eu -o pipefail
 
 # build directory as optional first argument, otherwise $PWD
 # we assume PWD is inside the CMake build directory
@@ -46,9 +47,9 @@ rm -rf diags.zip diags
 # make sure we do not need write access when reading data
 chmod u-w samples/git-sample/*.h5
 chmod u-w samples/git-sample/thetaMode/*.h5
-chmod u-w samples/samples/issue-sample/*.h5
-chmod u-w samples/samples/issue-sample/no_fields/*.h5
-chmod u-w samples/samples/issue-sample/no_particles/*.h5
+chmod u-w samples/issue-sample/*.h5
+chmod u-w samples/issue-sample/no_fields/*.h5
+chmod u-w samples/issue-sample/no_particles/*.h5
 find samples/git-sample/3d-bp4 -type f -exec chmod u-w {} \;
 
 cd ${orgdir}