[!810] [bugfix][cmake] Correct installation rules for headers in dune/python/common
Merge branch 'bugfix/dune-python-installation-paths' into 'master'
ref:core/dune-common\> One header was installed, but did not exist, another
one was not installed.
See merge request [!810]
[!810]: gitlab.dune-project.org/core/dune-common/merge_requests/810