git-p4: Process detectCopiesHarder with --bool

Signed-off-by: Vitor Antunes <vitor.hda@gmail.com>
Acked-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/contrib/fast-import/git-p4 b/contrib/fast-import/git-p4
index 29a5390f..0db3e72 100755
--- a/contrib/fast-import/git-p4
+++ b/contrib/fast-import/git-p4
@@ -789,7 +789,7 @@
         elif detectCopies != "" and detectCopies.lower() != "false":
             diffOpts += " -C%s" % detectCopies
 
-        if gitConfig("git-p4.detectCopiesHarder").lower() == "true":
+        if gitConfig("git-p4.detectCopiesHarder", "--bool") == "true":
             diffOpts += " --find-copies-harder"
 
         diff = read_pipe_lines("git diff-tree -r %s \"%s^\" \"%s\"" % (diffOpts, id, id))