FIX: Disable print button when gcode has conflict

Also fix a crash bug due to setStarted and setDone.

Change-Id: Ib9b069fe4b7e5d1fc359f48e44b4032dd8249428
(cherry picked from commit 9ef190ed3ecd66d12617ad96e927ff34251395a2)

src/slic3r/GUI/GCodeViewer.cpp

@@ -1097,6 +1097,9 @@ void GCodeViewer::load(const GCodeProcessorResult& gcode_result, const Print& pr
     m_layers_slider->set_as_dirty();
     m_moves_slider->set_as_dirty();
 
+    //BBS
+    m_conflict_result = gcode_result.conflict_result;
+
     //BBS: add mutex for protection of gcode result
     gcode_result.unlock();
     //BBS: add logs