App: Reduce BOOST_VERSION workaround to fix boost symbol linker error on Win-Qt5.

src/App/Application.cpp

@@ -3061,7 +3061,7 @@ void Application::LoadParameters()
     }
 }
 
-#if defined(_MSC_VER) && BOOST_VERSION < 108300
+#if defined(_MSC_VER) && BOOST_VERSION < 108200
     // fix weird error while linking boost (all versions of VC)
     // VS2010: https://forum.freecad.org/viewtopic.php?f=4&t=1886&p=12553&hilit=boost%3A%3Afilesystem%3A%3Aget#p12553
     namespace boost { namespace program_options { std::string arg="arg"; } }