Fix ReagentQuantity Equality check (#39574)

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

Content.Shared/Chemistry/Reagent/ReagentQuantity.cs

@@ -52,7 +52,7 @@ public partial struct ReagentQuantity : IEquatable<ReagentQuantity>
 
     public bool Equals(ReagentQuantity other)
     {
-        return Quantity != other.Quantity && Reagent.Equals(other.Reagent);
+        return Quantity == other.Quantity && Reagent.Equals(other.Reagent);
     }
 
     public override bool Equals(object? obj)