Windows: Add "Segoe UI Emoji" and "Segoe UI Symbol" as fallback fonts.

This enables rendering of Emoji symbols.

Task-number: QTBUG-45811
Change-Id: I7cb128dab717870929e02ea9ec253f36fef29804
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>

src/plugins/platforms/windows/qwindowsfontdatabase.cpp

@@ -1631,6 +1631,8 @@ QStringList QWindowsFontDatabase::extraTryFontsForFamily(const QString &family)
             ++tf;
         }
     }
+    result.append(QStringLiteral("Segoe UI Emoji"));
+    result.append(QStringLiteral("Segoe UI Symbol"));
     return result;
 }