aliasing some plural hands_on_* to singular hand_on_*

BUR #7425 has been approved by @evazion.

create alias hands_on_wall -> hand_on_wall
create alias hands_on_glass -> hand_on_glass
create alias hands_on_window -> hand_on_window

Aliasing singular to plural.
There were also for table, mirror, ground and floor but I'm not sure if they're distinct enough or not.

If we want to alias them they should point to the singular.

nonamethanks said:

If we want to alias them they should point to the singular.

Sure, edited the BUR.

The bulk update request #7425 (forum #197729) has been approved by @evazion.