[!127] install script only called make install_python on modules depending on

Merge branch 'bugfix/installScript' into 'master'

ref:staging/dune-python dune-python. If a module depended for example
dune-fempy would not be considered

See merge request [!127]

  [!127]: gitlab.dune-project.org/staging/dune-python/merge_requests/127
1 job for master in 11 minutes and 33 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #97531
duneci
debian:9 gcc

00:11:33