Remove a "TODO" comment (answer: it's for moves like Copycat/etc)

src/phases/move-phase.ts

@@ -200,7 +200,6 @@ export class MovePhase extends BattlePhase {
     }
 
     // Update the battle's "last move" pointer, unless we're currently mimicking a move.
-    // TODO: what does this accomplish? what would break if we didn't do it?
     if (!allMoves[this.move.moveId].hasAttr(CopyMoveAttr)) {
       this.scene.currentBattle.lastMove = this.move.moveId;
     }