Remove unused variable `bothsds`

In 81e55ec0 the code here changed and now bothsds is not needed anymore.

Fixes the warning:

    object.c: In function ‘compareStringObjectsWithFlags’:
    object.c:350:9: warning: variable ‘bothsds’ set but not used [-Wunused-but-set-variable]
         int bothsds = 1;
             ^