git-gui: do not add directories to PATH on Windows

git-gui on Windows prepends three directories to PATH so does not honor
PATH as configured. This can have undesirable consequences, for instance
by preventing use of a different git for testing.  This also provides at
best a subset of the configuration included with Git for Windows (g4w),
so is neither necessary nor sufficient there.

Since commit be700fe3, git-gui.sh adds its directory to the front of
PATH: this is essentially adding $(git --execdir) to the path, this is
long deprecated as git moved to using "dashless" subcommands.

The windows/git-gui.sh wrapper file, since commit 99fe594d, adds two
directories relative to its installed location to PATH, and does so
without checking that either exists or is needed.

The above modifications were made before the Git For Windows project
took responsibility for distributing a working solution on Windows. g4w
assures a correct configuration on Windows without these, and doing so
requires more than the above modifications.  See [1] for a more thorough
treatment.

git-gui does not modify PATH on any platform except on Windows, and
doing so is not needed by g4w.  Let's stop modifying PATH on Windows as
well.

[1] https://gitforwindows.org/git-wrapper.html

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>

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