Delete Resource Menu Button Fix

[shinobu]

The Menu Button 'Delete Resource' now uses the same way to produce the delete URL as the Toolbar Delete button does.

This is most likely not like it was intended (the use of the OntoWiki_Url class should be the correct way), but i couldn't find the direct source for the error in the OntoWiki_Url Class

[shinobu]

This should fix the problem with the delete url.

But it's odd that the function for creating the delete button gets called more often than just once and the first call actually worked without the string cast, but the second one had problems with it that way

[white-gecko]

Sorry forgot to document this:

• [x] manual review commits
• [x] check unit tests: OK (86 tests, 151 assertions)
• [x] check integration tests virtuoso: Tests: 27, Assertions: 138, Errors: 1. (was before)
• [x] check integration tests mysql: OK (27 tests, 139 assertions)