This PR corrects several places where `BASE_FEATURE` is being used to rely on the two-arg variant of this macro. This particular PR has no functional changes, and the only feature declarations affected are the ones for which the feature-name constant, and the actual value are identical. The particular issue for this will be left open so subsequent work for the other features can be followed up on. Bug: https://github.com/brave/brave-browser/issues/50492