Updated "Shift textures randomly" also work with patches

[klaussilveira]

Fixes: https://bugs.thedarkmod.com/view.php?id=6353

[codereader]

Nice. Added this method to the wiki: https://wiki.thedarkmod.com/index.php?title=DarkRadiant_Script_Reference#PatchNode

[FrostSalamander]

Although this is great, it works slightly different than shifting brush textures.

If you shift brush textures, this is what happens:

1. select the brush (or brush face)
2. click Scripts -> Shift textures randomly...
3. you immediately see the texture shift in front of your eyes

If it's a patch:

1. select the patch
2. click Scripts -> Shift textures randomly...
3. nothing happens
4. click somewhere on the screen or press ESC to deselect the texture
5. you see the texture shift

I know it sounds nitpicky, but just thought I would raise it in case it's easy to make it consistent.