Correctly remove the test directory again in cd test

tests/cd.in

@@ -39,16 +39,16 @@ complete -C'ls ../'
 echo "cd:"
 complete -C'cd ../'
 
-# cd back before removing the test directory again.
-cd $oldpwd
-rm -Rf $base
-
 logmsg Virtual PWD inheritance
 # PWD should be imported and respected by fish
 
+cd $oldpwd
 mkdir -p $base/realhome
 set fish_path $PWD/../test/root/bin/fish
 ln -s $base/realhome $base/linkhome
 cd $base/linkhome
 env HOME=$base/linkhome $fish_path -c 'echo PWD is $PWD'
 
+# cd back before removing the test directory again.
+cd $oldpwd
+rm -Rf $base