Properly update hidden effects #13173
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Closes #13172
When an effect of the same type is added to an entity, we construct a new MobEffectInstance-instance and update that to see if any property of the existing effect can be overriden by the new effect. This works well, except for that the update method also has one extra side effect, namely updating the hidden effect, which doesn't count as overriding anything.
This PR adds some extra logic to check if the new effect should be added as a hidden effect if it isn't already being overriden, so that no effect gets lost.
Tested by drinking a long regeneration potion and a short regeneration 2 potion, regardless of which potion was drank first the longer effect always returned after the short one ended.