fix(clearkey): Do not pad data before decryption

This is seemingly unnecessary and simply incorrect at least for two sources (VGTV, and TRUTV).

Without this change it is not possible to correctly merge all segments without at least some problem in the resulting file.

devine/core/drm/clearkey.py

@@ -7,7 +7,7 @@
 from urllib.parse import urljoin
 
 from Cryptodome.Cipher import AES
-from Cryptodome.Util.Padding import pad, unpad
+from Cryptodome.Util.Padding import unpad
 from m3u8.model import Key
 from requests import Session
 
@@ -43,7 +43,7 @@ def decrypt(self, path: Path) -> None:
 
         decrypted = AES. \
             new(self.key, AES.MODE_CBC, self.iv). \
-            decrypt(pad(path.read_bytes(), AES.block_size))
+            decrypt(path.read_bytes())
 
         try:
             decrypted = unpad(decrypted, AES.block_size)