[embedthumbnail] Correctly escape filename

Closes #352
The approach in [1] is faulty as can be seen in the test cases
1. https://github.com/ytdl-org/youtube-dl/commit/bff857a8af696e701482208617bf0b7564951326
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pukkandan committed 2021-05-29 02:31:14 +05:30
1 parent 885cc0b75c
commit 337e0c62f8
5 files changed
+75 -56

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