Change Hint Mode for FromAssumption.
There is no need to restrict the type class using Hint Mode, we have a default instance that will always be used first. In case of evars, the default instance should apply. The reason for this change is that `iAssumption` should be able to prove `H : ?e |- P` and `H : P |- ?e`. The former Hint Mode prevented it from doing that.
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