Encrypting the PGP public key is unnecessary

[brassy-endomorph]

Is your feature request related to a problem? Please describe.

PGP public keys do not need to be encrypted.

hushline/hushline/model.py

Lines 127 to 136 in 53c65ee

	@property
	def pgp_key(self) -> str | None:
	return decrypt_field(self._pgp_key)
	@pgp_key.setter
	def pgp_key(self, value: str) -> None:
	if value is None:
	self._pgp_key = None
	else:
	self._pgp_key = encrypt_field(value)

Describe the solution you'd like

Store the field as plaintext