Fix a couple of thematic break tests (162 passed, 150 before)
Fix a couple of thematic break tests (162 passed, 150 before)

I'm not sure how much more elegant the patterns can be considering they're not regular expressions (fixes 9 tests, up to 159).

Also insert a couple of newlines where appropriate insofar as it came up during https://github.com/koreader/koreader/pull/2761.

Switching newlines to `\n` passes another 3 tests (up to 162).

Frenzie/luamd,bakpakin/luamd