osk-sdl: update to 0.53

As Idan Horo wrote in osk-sdl!82:
"Newer versions of cryptsetup automatically encrypt with LUKS v2.
osk-sdl assumes all partitions are encrytped with v1 and as such fails.
By just changing the encryption type to NULL cryptsetup automatically
detects and chooses the correct LUKS version. Tested on xiaomi-kenzo."
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