Fix t3200 on MinGW

Since we try to launch the webbrowser with "git <command> --help",
one test in t3200 would always try to open a window with the
man page for git-branch.  Suppress that test for now.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

t/t3200-branch.sh

@@ -17,6 +17,7 @@ test_expect_success \
      git-commit -m "Initial commit." &&
      HEAD=$(git rev-parse --verify HEAD)'
 
+true ||
 test_expect_failure \
     'git branch --help should not have created a bogus branch' \
     'git branch --help </dev/null >/dev/null 2>/dev/null || :