Patched PDA scanner to be more useful

PDA's integrated scanner was VERY rudimentary. Patched it to resolve
some formatting issues and improve usability.
Update PDA.dm

Patched the comment to match the actual, final behavior (Doh!)
Merge branch 'master' of https://github.com/baystation12/baystation12
Merge pull request #5514 from JimTheCactus/master

Patched PDA scanner to be more useful