libmat2/pdf: Drop printing 'lol'

It seems this was committed without intention to do so.
10 jobs for drop-printing-lol in 3 minutes and 21 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Linting
passed linting:bandit #213281

00:00:12

passed linting:codespell #213282

00:00:11

passed linting:mypy #213285

00:00:12

passed linting:pyflakes #213284

00:00:11

passed linting:pylint #213283

00:00:23

 
  Test
passed tests:archlinux #213286

00:02:24

passed tests:debian #213287

00:01:47

failed tests:debian_with_bubblewrap #213288
allowed to fail

00:00:44

passed tests:fedora #213289

00:01:56

passed tests:gentoo #213290

00:02:55

 
Name Stage Failure
failed
tests:debian_with_bubblewrap Test

----------------------------------------------------------------------
Ran 120 tests in 29.847s

FAILED (failures=6, errors=37)
[+] Testing pdf
[+] Testing png
Cleaning up file based variables
ERROR: Job failed: exit code 1