Fix double [still] in Gen 1 (#5491)
Fix double [still] in Gen 1 (#5491)

Moves with the 'charge' flag add the 'twoturnmove' volatile which
already handles adding [still].
sirDonovan/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Enigami/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,panpawn/Gold-Server,Enigami/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,svivian/Pokemon-Showdown,Enigami/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,svivian/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,AustinXII/Pokemon-Showdown,AustinXII/Pokemon-Showdown,urkerab/Pokemon-Showdown,xfix/Pokemon-Showdown,urkerab/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,urkerab/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,panpawn/Gold-Server,panpawn/Gold-Server,Zarel/Pokemon-Showdown,Enigami/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown