Fixed a bug in GitX (L) that for some cases the "file link" in the changes-of-a-commit view cannot jump

[johnnytemp]

Any "file link" in the changes-of-a-commit view cannot jump, when the file's path contain substring "b/", e.g. file path cab/xxx.txt. However, if the path have a folder with name ended in " b" (very rare), it will not work, still.