ShellPkg: fix redirection file parsing to allow spaces before filename.
ShellPkg: fix redirection file parsing to allow spaces before filename.

signed-off-by: jcarsey
reviewed-by: darylm503

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@12962 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2