[BUG] Videos with space in their path aren't processed by ffmpeg

[EDM115]

Same thing as in #269, should also make the safeguards introduced in #133 useless
description of df6cd36 should help

unzip-bot/unzipper/modules/ext_script/up_helper.py

Line 189 in 837767c

f"ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {doc_f}"

unzip-bot/unzipper/modules/ext_script/up_helper.py

Line 216 in 837767c

f"ffmpeg -ss 00:00:00.00 -i {doc_f} -vf 'scale=320:320:force_original_aspect_ratio=decrease' -vframes 1 {thmb_pth}"

we really should escape the paths