[Bug] Fix toxic damage increment not resetting upon switching (#1844)

* Update phases.ts

Add reset toxic turn counter in PostSummonPhase

* Update phases.ts

Fix linting

src/phases.ts

@@ -1162,6 +1162,9 @@ export class PostSummonPhase extends PokemonPhase {
 
     const pokemon = this.getPokemon();
 
+    if (pokemon.status?.effect === StatusEffect.TOXIC) {
+      pokemon.status.turnCount = 0;
+    }
     this.scene.arena.applyTags(ArenaTrapTag, pokemon);
     applyPostSummonAbAttrs(PostSummonAbAttr, pokemon).then(() => this.end());
   }