libmat2/pdf: Drop printing 'lol'

It seems this was committed without intention to do so.
10 jobs for master in 3 minutes and 26 seconds (queued for 7 seconds)
Status Name Job ID Coverage
  Linting
passed linting:bandit #218275

00:00:12

passed linting:codespell #218277

00:00:10

passed linting:mypy #218281

00:00:12

passed linting:pyflakes #218280

00:00:10

passed linting:pylint #218279

00:00:22

 
  Test
passed tests:archlinux #218283

00:01:17

passed tests:debian #218284

00:01:11

failed tests:debian_with_bubblewrap #218286
allowed to fail

00:00:40

passed tests:fedora #218287

00:01:19

passed tests:gentoo #218289

00:03:01

 
Name Stage Failure
failed
tests:debian_with_bubblewrap Test
AssertionError: False is not true

----------------------------------------------------------------------
Ran 120 tests in 28.538s

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