Setting PASSWORD_STORE_DIR=. (current directory) causes git commit to fail in subdir

[Klaus Rennecke]

Cause: set_git tries to guess the git top-level folder but fails in
subdir.
Solution: INNER_GIT_DIR=$(git -C "${1%/*}" rev-parse --show-toplevel
2>/dev/null || true)
This will also handle submodules, in a fashion.
Steps to repeat:
$ cd /tmp$ mkdir pass-test$ cd pass-test$ PASSWORD_STORE_DIR=. pass
init **********Password store initialized for **********$ git init
.Initialized empty Git repository in /tmp/pass-test/.git/$ mkdir -p
some/folder$ PASSWORD_STORE_DIR=. pass insert some/folder/testEnter
password for some/folder/test:Retype password for
some/folder/test:fatal: pathspec './some/folder/test.gpg' did not match
any files$ git statusOn branch masterUntracked files:  (use "git add
<file>..." to include in what will be committed)
	.gpg-id	some/
nothing added to commit but untracked files present (use "git add" to
track)$ pass --version=============================================
pass: the standard unix password manager
==                                          ==                  v1.7.3 
                 ==                                          ==        
     Jason A.
Donenfeld           ==               Jason at zx2c4.com            ==     
                                     ==      
http://www.passwordstore.org/       ===================================
==========$ 


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