Hide the quoted email when display an encrypted reply

[DenBond7]

We have simple check for finding lines which start from On and end with wrote: - https://github.com/FlowCrypt/flowcrypt-ios/blob/72cb26b61786a736f91f6dad2c0a42d655410237/FlowCrypt/Functionality/Mail%20Provider/Message%20Provider/ProcessedMessage.swift#L160

Originally posted by @sosnovsky in #2902