Tag Alias: pawprint -> paw_print

Aliasing pawprint -> paw_print.

Reason: Both mean the same, but paw_print is more common and has a wiki page.

I just retagged the 6 images of pawprint to paw_print.

I'm not sure an alias is needed, since neither tag has been used all that much. 7 originally for pawprint and 9 for paw_print. The paw_print tag didn't even exist before this month and the wiki was just made today.

Created anyway.