Fix `manual_is_variant_and` condition generation (#15206)

When comparing `x.map(func) == Some(bool_lit)`, the value of `bool_lit`
was ignored, despite the fact that its value should determine the value
of the proposed expression.

`func` can be either a closure or a path. For the latter, η-expansion
will be used if needed to invert the result of the function call.

changelog: [`manual_is_variant_and`]: fix inverted suggestions that
could lead to code with different semantics

Fixes rust-lang/rust-clippy#15202

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### Summary Notes

-
[Beta-nomination](https://github.com/rust-lang/rust-clippy/pull/15206#issuecomment-3034006613)
by [samueltardieu](https://github.com/samueltardieu)

*Managed by `@rustbot`—see
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