Add path to accommodate macOS' dynamic $TMPDIR

Per a report from Lakshay Garg <lakshayg@outlook.in>, the use of $TMPDIR
in the Vim plugin's pattern match does not work on macOS X, due to the
dynamic and symbolically-linked temporary dir structure this system
uses.  Lakshay's email to me, which includes a full explanation, is
reproduced with his permission below.

This change is reflected in upstream v2.2.2:
<https://sanctum.geek.nz/cgit/vim-redact-pass.git/commit/?h=v2.2.2>

>Date: Sat, 13 Feb 2021 23:59:22 -0800
>From: Lakshay Garg <lakshayg@outlook.in>
>To: tom@sanctum.geek.nz
>Subject: [PATCH] vim: fix redact_pass.vim for macOS
>
>Hi Tom
>
>Thanks for maintaining redact_pass.vim. I came across an issue in the
>plugin a few months ago and submitted a patch for it to the
>password-store mailing list but did not get any responses. It seems
>like since only you have been maintaining that file, I might have
>better luck sending the patch to you.
>
>---
>
>Problem: redact_pass.vim did not work on macOS machines
>Fix: add resolve($TMPDIR) to the autcmd pattern list
>
>Explanation
>===========
>
>pass creates files under /private/var/<some-stuff> on macOS.
>redact_pass.vim uses the following pattern to detect when to
>enable the plugin:
>
>```
>$TMPDIR/pass.?*/?*.txt
>```
>
>This pattern expands to "/var/<some-stuff>//pass.?*/?*.txt"
>on my macbook and has two problems:
>
>1. The double forward slash in the expanded pattern (after <some-stuff>)
>2. pass uses /private/var but the pattern looks for /var
>
>Turns out, /var on macos is just a symlink to /private/var.
>The autocmd fails to trigger because it is trying to match
>the pattern: "/var/<some-stuff>//pass.?*/?*.txt"
>to filename: "/private/var/<some-stuff>/pass.<random-chars>/<random-chars>.txt"
>
>The simplest fix is to make $TMPDIR point to "/private/var/..."
>which is achieved by calling resolve on $TMPDIR prior to running
>the autocmd. This also handles the double forward-slash.
>
>Thanks again
>Lakshay

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