Fix font-weight regression

Do not override the requested font-weight. This was a wrong rewrite of
a now redundant if-statement.

Change-Id: I20a745cac02d896fdeaa853f20c6b6647084fceb
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

src/gui/text/qfontdatabase.cpp

@@ -2730,7 +2730,6 @@ void QFontDatabase::load(const QFontPrivate *d, int script)
     }
     if (req.pointSize < 0)
         req.pointSize = req.pixelSize*72.0/d->dpi;
-    req.weight = QFont::Normal;
     if (req.stretch == 0)
         req.stretch = 100;