[pass] [PATCH] Fix pass completion syntax and autoloading

[Marc Cornellà]

BTW, I haven't tested it because I don't have pass installed, but this
stops the errors from appearing
for the reasons posted in the commit message.
I don't know if quoting the parameters mess up completion when *there are*
passwords in `.password-store`,
just because I don't have pass. If that's the case, serve this PR as a
starting point to solve said problem.

What *should* work without further modifications is the `_pass` statement
added at the end, which is
necessary for the first tab completion to work. That is the standard syntax
for zsh completion files.

Thanks again,

Marc Cornellà
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