BaseTools/toolsetup.bat: fixed the error when the path contains space

BaseTools/toolsetup.bat: fixed the error when the path contains space

We have a new simple and effective method to resolve the original issue
that the PATH env's update error when the path contains space, so this
patch remove the last check in and use the new method to fix the original
issue.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19028 6f19259b-4bc3-4df7-8a09-765794883524