Fix max_bridge_length for organic tree (#11295)

* Remove outdated duplicated support code

* Orgainc tree no longer use `bridge_no_support` since #8212

src/libslic3r/Support/SupportMaterial.cpp

@@ -1390,7 +1390,6 @@ static inline ExPolygons detect_overhangs(
     double thresh_angle = object_config.support_threshold_angle.value > 0 ? object_config.support_threshold_angle.value + 1 : 0;
     thresh_angle = std::min(thresh_angle, 89.); // BBS should be smaller than 90
     const double threshold_rad = Geometry::deg2rad(thresh_angle);
-    const coordf_t max_bridge_length = scale_(object_config.max_bridge_length.value);
     const bool bridge_no_support = object_config.bridge_no_support.value;
     const coordf_t xy_expansion = scale_(object_config.support_expansion.value);
     float lower_layer_offset = 0;