Debian: fixed rules (build and binary targets)

* dh_testdir would sometimes cause problems on the PPA servers,
  so we replaced it with an empty rule.
* We need to define the binary-arch and binary-indep targets
  in order to recurse into the correct subdirectories.
  I do not understand why this always worked on the Github runner
  and sometimes even on the PPA servers.
  Unfortunately, we cannot just call `dh binary-arch -B... -p...`
  since that would call `dh_install -a` which overrides any `-p` (package),
  thus trying to install the curses binaries from the Gtk build directory
  and vice versa.

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