Bug 18701: Translatability: Get rid of exposed tt directives in matching-rules.tt

Bug 18701: Translatability: Get rid of exposed tt directives in matching-rules.tt

Translation for file matching-rules.tt exposes a lot of template directives.

Translators should not be confronted with internal code like the following:

[%% PROCESS norms_select selected_norm=\"none\" id=\"mc_1_src_c_1_n_1_norm\" "name=\"mc_1_src_c_1_n_1_norm\" %%]

To test:
- Apply patch
- Verify that code changes make sense (removes line breaks in directives)
- Run QA tools in newset version (tests for line breaks in tt)
- Bonus test: create a new translation e.g. fpr language 'aa-AA', verify
  that such lines no longer appear in po/aa-AA-staff-prog.po
  (for matching-rules.tt)

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>