VC cannot decrypt keystores with encryption password ending in specific character(s)

[philknows]

Describe the bug

The validator client is unable to decrypt a keystore if the encryption password ends in the | character. I haven't tried to see if other characters create the same behaviour, but this character triggers it and you will receive the following response in the VC:

 ✖ Error: Invalid password
    at Object.<anonymous> (/usr/app/node_modules/@chainsafe/bls-keystore/lib/functional.js:86:19)
    at Generator.next (<anonymous>)
    at fulfilled (/usr/app/node_modules/@chainsafe/bls-keystore/lib/functional.js:5:58)

Will update if other characters trigger the same result

Expected behavior

Passwords should be able to use any special character and not encounter errors during decryption.

Steps to Reproduce

1. Create a keystore.json file and encrypt it with a password ending in |
2. Run the VC on this keystore
3. Observe Error: Invalid password response

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 22.04.1
• Version: v1.5.1/3d937ee
• Branch: unstable
• Commit hash: 3d937ee

[dapplion]

@nflaig can you take a look?

[nflaig]

@dapplion have it on my list already, will look into it today/tomorrow