edksetup.sh: Code style

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15199 6f19259b-4bc3-4df7-8a09-765794883524
edksetup.sh: Fix typo and return code

The typo was a check for the string "BaseTool" instead of "BaseTools".

Also fixed the issue where the script returned success even when
configuration failed.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15200 6f19259b-4bc3-4df7-8a09-765794883524