Update programtv.onet.pl

[freearhey]

Added image to the output.

Closes #2868

npm test --- programtv.onet.pl                                           

> test
> cross-env TZ=Pacific/Nauru npx jest --runInBand programtv.onet.pl

 PASS  sites/programtv.onet.pl/programtv.onet.pl.test.js
  ✓ can generate valid url (10 ms)
  ✓ can generate valid url for next day (3 ms)
  ✓ can parse response (132 ms)
  ✓ can handle empty guide (3 ms)

Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        1.118 s
Ran all test suites matching programtv.onet.pl.