Replace Windows conflicting "LoadIcon" with "SetIcon"

Windows headers defines LoadIcon to LoadIconW when UNICODE is defined.

src/device/deviceinfo.h

@@ -98,7 +98,7 @@ class DeviceInfo : public SimpleTreeItem<DeviceInfo> {
   DeviceDatabaseBackend::Device SaveToDb() const;
 
   // Tries to load a good icon for the device.  Sets icon_name_ and icon_.
-  void LoadIcon(const QVariantList &icons, const QString &name_hint);
+  void SetIcon(const QVariantList &icons, const QString &name_hint);
 
   // Gets the best backend available (the one with the highest priority)
   const Backend *BestBackend() const;