inlining: follow up #47371, remove unused override_effects keyword arg

[aviatesk]

This keyword argument was introduced by #47305, which was then reverted by #47371. Now it's dead, so let's remove it.

[aviatesk]

@brenhinkeller The label effects doesn't probably very fit with this PR (since it's supposed to be put on direct changes on the effect system) but rather the optimizer label does because this PR changes some implementation detail of the inlining algorithm. I'd appreciate if you add labels when you're sure they apply.

[brenhinkeller]

Sure -- currently the "effects" tag description is very generic though FWIW.

[aviatesk]

Yeah, to elaborate a bit, it's a part of our abstract interpretation algorithm so it'd apply when we change some code within base/compiler/[abstractinterpretation|tfuncs|typeinfer.jl].