contrib/jenkins.sh: "maintainer-clean" after "publish"

Run "make maintainer-clean" after publishing manuals, not the other way
around. Otherwise jenkins.sh fails when running for the master branch,
because docs/manuals/Makefile gets deleted although it is still needed
to publish the manuals.

Related: OS#3047
Fixes: 471fd92170297f1c857bb448bbf21a162c2ed655 ("contrib/jenkins.sh: run "make maintainer-clean"")
Change-Id: I8ba5369b0948b61c68f43d807312c52465119aa5
1 file changed