t9010 (svn-fe): use Unix-style path in URI

Ever since v1.6.3-rc0~101^2~14 (Tests on Windows: $(pwd) must return
Windows-style paths, 2009-03-13), there is a subtle difference between
$(pwd) and $PWD in tests: the former returns Windows-style paths as
might be output by git and the latter Unix-style paths which msys
programs tend to prefer.

In file:// URIs, Unix-style paths are needed.  Before: “svn export”
declares it cannot find

 file://c:/apps/git/git/t/trash directory/simple-svco

After: “svn export” successfully finds

 file:///c/apps/git/git/...

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9010-svn-fe.sh

@@ -10,7 +10,7 @@ test_dump() {
 	test_expect_success "$dump" '
 		svnadmin create "$label-svn" &&
 		svnadmin load "$label-svn" < "$TEST_DIRECTORY/$dump" &&
-		svn_cmd export "file://$(pwd)/$label-svn" "$label-svnco" &&
+		svn_cmd export "file://$PWD/$label-svn" "$label-svnco" &&
 		git init "$label-git" &&
 		test-svn-fe "$TEST_DIRECTORY/$dump" >"$label.fe" &&
 		(