rgw_user.cc:

Remove bool variable 'same_email' compare emails directly in
if check.

Fix for:
[src/rgw/rgw_user.cc:1926] -> [src/rgw/rgw_user.cc:1927]: (performance)
 Variable 'same_email' is reassigned a value before the old one has been used.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>