Make /dt dex-number lookup stricter
Make /dt dex-number lookup stricter

Previously, passing anything that started with a number to /dt would
make it look it up as a dex number.

This made it impossible to look up "10,000,000 Volt Thunderbolt".

Now, it has to be exactly a number and nothing else, to be considered
a dex number for the /dt lookup.

AustinXII/Pokemon-Showdown,panpawn/Pokemon-Showdown,xfix/Pokemon-Showdown,HoeenCoder/SpacialGaze,panpawn/Gold-Server,sirDonovan/Pokemon-Showdown,svivian/Pokemon-Showdown,ShowdownHelper/Saffron,svivian/Pokemon-Showdown,HoeenCoder/SpacialGaze,panpawn/Gold-Server,Zarel/Pokemon-Showdown,HoeenCoder/SpacialGaze,AustinXII/Pokemon-Showdown,DesoGit/Tsunami_PS,AWailOfATail/Pokemon-Showdown,urkerab/Pokemon-Showdown,HoeenCoder/SpacialGaze,QuiteQuiet/Pokemon-Showdown,xfix/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Zarel/Pokemon-Showdown,urkerab/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,Enigami/Pokemon-Showdown,panpawn/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Enigami/Pokemon-Showdown,Enigami/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,xCrystal/Pokemon-Showdown,panpawn/Gold-Server,QuiteQuiet/Pokemon-Showdown,AustinXII/Pokemon-Showdown,svivian/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown,DesoGit/Tsunami_PS,jumbowhales/Pokemon-Showdown,xfix/Pokemon-Showdown,xCrystal/Pokemon-Showdown,ShowdownHelper/Saffron,svivian/Pokemon-Showdown,urkerab/Pokemon-Showdown,Enigami/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,danpantry/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,ShowdownHelper/Saffron,DesoGit/Tsunami_PS,AWailOfATail/Pokemon-Showdown,danpantry/Pokemon-Showdown,xCrystal/Pokemon-Showdown