Bug 37824: remove references to non-existent files in Makefile.PL

Bug 37824: remove references to non-existent files in Makefile.PL

to test...

0/ install debhelper tool

1/ run 'DEB_BUILD_OPTIONS=nocheck dh build', observe failure
    make: *** No rule to make target 'koha-tmpl/intranet-tmpl/prog/js/vue/dist/erm.js.LICENSE.txt', needed by 'pm_to_blib'.  Stop.
    dh_auto_build: error: make -j1 returned exit code 2

2/ apply patch

3/ run 'DEB_BUILD_OPTIONS=nocheck dh build', observe success

Signed-off-by: Blou <blou@inlibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>