Remove fix_slicing_errors because it makes no sense (#2370)

this also fixes #2344

src/libslic3r/PrintObjectSlice.cpp

@@ -656,6 +656,7 @@ void reGroupingLayerPolygons(std::vector<groupedVolumeSlices>& gvss, ExPolygons
     }
 }
 
+/*
 std::string fix_slicing_errors(PrintObject* object, LayerPtrs &layers, const std::function<void()> &throw_if_canceled, int &firstLayerReplacedBy)
 {
     std::string error_msg;//BBS
@@ -777,6 +778,7 @@ std::string fix_slicing_errors(PrintObject* object, LayerPtrs &layers, const std
 
     return error_msg;
 }
+*/
 
 void groupingVolumesForBrim(PrintObject* object, LayerPtrs& layers, int firstLayerReplacedBy)
 {
@@ -813,7 +815,7 @@ void PrintObject::slice()
     m_print->throw_if_canceled();
     int firstLayerReplacedBy = 0;
 
-#if 1
+#if 0
     // Fix the model.
     //FIXME is this the right place to do? It is done repeateadly at the UI and now here at the backend.
     std::string warning = fix_slicing_errors(this, m_layers, [this](){ m_print->throw_if_canceled(); }, firstLayerReplacedBy);