backjump to level of clause to ensure that new atoms created by projection are assigned as assumptions fix #2557

Signed-off-by: Nikolaj Bjorner <[email protected]>

Author: NikolajBjorner

src/qe/nlqsat.cpp

@@ -475,9 +475,6 @@ namespace qe {
             else {
                 SASSERT(clevel.max() + 2 <= level());
                 num_scopes = level() - clevel.max();
-                if ((num_scopes % 2) != 0) {
-                    --num_scopes;
-                }
                 SASSERT(num_scopes >= 2);
             }