fix(pass): fix KeePass import of legacy TOPT definition

[nagromc]

According to the KeePassXC source code, there are at least two TOTP definition formats:

• the modern format: a unique custom TOTP field (otp) using the otpauth:// URI format;
• the legacy format: two different custom fields (TOTP Seed and TOTP Settings).

This fixes the import of TOTP definitions using the legacy format.

[nagromc]

For reference, the bug has been reported on Reddit in May: https://www.reddit.com/r/ProtonPass/comments/13oqruk/comment/jl79ld1

[D-Bao]

Merged in https://github.com/ProtonMail/WebClients/commit/16a64e662109348c6df0254ed09a0a0d4cd5094f. This will be very useful for users who stored their TOTP in a legacy KeePassXC version, thanks a lot for your contribution!