tesseract: remove unused variable

Signed-off-by: Jerome Flesch <jflesch@openpaper.work>
2 jobs for master in 9 minutes and 57 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #370045
volatile linux
check

00:05:48

failed #370046
volatile linux
test

00:04:09

 
Name Stage Failure
failed
test Test
Processing triggers for mime-support (3.62) ...
Processing triggers for ca-certificates (20190110) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
$ apt-get install -y -qq python-tox
E: Unable to locate package python-tox
ERROR: Job failed: exit code 1