Revert "513019 nsslapd-lookthroughlimit is not respected"

This reverts commit 1e3138f1d41562d6f42a8fdf0934af23219bb8e1.

Misunderstood nsslapd-lookthroughlimit.  Regardless of the filter test result,
once hit the lookthroughlimit, search should be aborted there.  That's what
the original code does and that is correct.

ldap/servers/slapd/back-ldbm/ldbm_search.c

@@ -1410,9 +1410,6 @@ ldbm_back_next_search_entry_ext( Slapi_PBlock *pb, int use_extension )
                   rc = SLAPI_FAIL_GENERAL;
                   goto bail;
               }
-              /* Since the filter test failed, the result won't be sent.
-               * sr_lookthroughcount should be decremented. */
-              --sr->sr_lookthroughcount;
           }
         }
     }