Fix chemical explosion scaling. (#41153)

Fix area reaction scaling

Co-authored-by: Princess Cheeseballs <66055347+Pronana@users.noreply.github.com>

Content.Shared/EntityEffects/Effects/Transform/FlashEntityEffectSystem.cs

@@ -76,6 +76,8 @@ public sealed partial class Flash : EntityEffectBase<Flash>
     [DataField]
     public SoundSpecifier? Sound = new SoundPathSpecifier("/Audio/Weapons/flash.ogg");
 
+    public override bool Scaling => true;
+
     public override string EntityEffectGuidebookText(IPrototypeManager prototype, IEntitySystemManager entSys)
         => Loc.GetString("entity-effect-guidebook-flash-reaction-effect", ("chance", Probability));
 }