[rtvs] Fixed extractor for Slovak television and radio #3098

Job	Run time
Select tests from inputs	1s
Linter	13s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 7s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	58s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 0s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 3s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 26s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 27s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 36s
Run tests (windows-2019, 3.4, cpython, core, bat)	2m 18s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	59s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 1s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	25s
	19m 43s

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