message: fix version string define
diff: #define LTHEMEENGINE_STRINGIFY(s) LTHEMEENGINE_TOSTRING(s)
  #define LTHEMEENGINE_VERSION_INT (LTHEMEENGINE_VERSION_MAJOR<<8 | LTHEMEENGINE_VERSION_MINOR)
  -#define LTHEMEENGINE_VERSION_STR LTHEMEENGINE_STRINGIFY(LTHEMEENGINE_VERSION_MAJOR.QT5CT_VERSION_MINOR)
  +#define LTHEMEENGINE_VERSION_STR LTHEMEENGINE_STRINGIFY(LTHEMEENGINE_VERSION_MAJOR.LTHEMEENGINE_VERSION_MINOR)
  #include <QString>
  #include <QStringList>
  