fix up hash-bang lines only of the scripts really installed by the current `make install` invocation

* The previous way of fixing up all `*.tes` scripts had the disadvantage
  of touching unrelated scripts or grosciteco/tedoc of a previous invocation.
  E.g. installing a Gtk build after the ncurses build would overwrite all hash-bang
  lines of the curses-version scripts as well with gsciteco.
* This caused problems with the RPM package where both variants were
  installed into the same buildroot and introduced a dependency from sciteco-curses
  to sciteco-gtk.
  This is worked around in sciteco.spec with a manual sed call.
* It would be better to get rid of the install-exec-hook altogether
  as it causes problems with FreeBSD/Poudriere (FIXME).

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