ShellPkg: patch to the "for" command when used with "in" iterating files in a folder. (for %x in *.txt). The result values (%x) have misplaced quotation marks and some spaces. 

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leandro G. Biss Becker <lbecker@positivo.com.br>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15212 6f19259b-4bc3-4df7-8a09-765794883524