Convert CRLF line endings to LF in Opera tests

The files were converted using dos2unix. All modified files were
then convert back using unix2dos to verify that there were no
intentional mixed line endings, which it appears there were not.

This leaves only some WebVTT files with (intentional) CRLFs.
Merge pull request #430 from foolip/crlf

Convert CRLF line endings to LF in Opera tests