FIX: brim generation with raft

in previous codes, we generate brim for an object with raft, which do not need brim.

jira-ID: https://jira.bambooolab.com/browse/STUDIO-4238
Change-Id: I4b2c2c1c744c098cdcfdb03c2100b06a458e983a
(cherry picked from commit 0d06415d42c95e40f79a228f75827588171d410c)

src/libslic3r/Brim.cpp

@@ -851,6 +851,8 @@ static ExPolygons outer_inner_brim_area(const Print& print,
                 double             maxSpeed = Model::findMaxSpeed(object->model_object());
                 // BBS: brims are generated by volume groups
                 for (const auto& volumeGroup : object->firstLayerObjGroups()) {
+                    // if this object has raft only update no_brim_area_object
+                    if (object->has_raft()) continue;
                     // find volumePtrs included in this group
                     std::vector<ModelVolume*> groupVolumePtrs;
                     for (auto& volumeID : volumeGroup.volume_ids) {