lisp/auth-source-pass.el: Keep legitimate spaces inside data

lisp/auth-source-pass.el: Keep legitimate spaces inside data

Users should be able to store a field as follows:
message: remember: Destroy the image and you will break the enemy

and later, recover the message untouched, i.e.:
"remember: Destroy the image and you will break the enemy"

* lisp/auth-source-pass.el (auth-source-pass--parse-data): Preserve
inner spaces at data.
* test/lisp/auth-source-pass-tests.el
(auth-source-pass-parse-with-colons-in-data): Add test.