[HomeApplication][WApps] Reorder icon issues

[p-czaja]

1. When moving item to next page, back to previous page and leave item, empty place for item appears and reorder event arguments are improper.
2. Steps to reproduce

• run modified sample from here (changed number of items to 11 and added reordered event handler)

• enable edit mode

• move 'Contacts' icon to left page (without dropping it)

• back to previous - right page

• drop the icon for example on the 'Apps' icon.

3. Result:

• empty place for item appeared at the old 'Contacts' icon
• Reordered event sent improper arguments: "Reordered item: Contacts from: 17 to: 2" (should be: from 7 to 2)

3. Tested on:

   cat /etc/info.ini
   [Version]
   Model=Tizen6/Unified;
   Build=tizen-unified_20200605.2;
   Release=20200605.2;
   [Build]
   Type=eng;
   Date=20200605_215033;
   Time=21:50:33;
   Variant=NONE;
   ID=tizen-unified;

[p-czaja]

@huiyueun, could you please take a look?

[huiyueun]

https://github.com/dalihub/nui-demo/pull/76