多盘bug修复

Author: dingjiwei

src/slic3r/GUI/PartPlate.cpp

@@ -3299,6 +3299,7 @@ void PartPlate::update_slice_result_valid_state(bool valid)
     if (valid)
         m_slice_percent = 100.0f;
     else {
+        m_apply_invalid = false;
         m_slice_percent = -1.0f;
     }
 }