BaseTools/toolsetup.bat: Fix bug caused by 'CONF_PATH' not defined
BaseTools/toolsetup.bat: Fix bug caused by 'CONF_PATH' not defined

In batch script files, setting a variable in an 'if' block will only take
effect after the 'if' block.

This commit fixes the issue of using the variable 'CONF_PATH' right after
it is being set in an 'if' block.

Cc: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>

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