[php-src] PR #23303: ext/uri: Fixes fragment handler registration

Pull Request: https://github.com/php/php-src/pull/23303 Author: NickSdot While working on https://github.com/php/php-src/pull/23286 the handler surfaced as uncovered. [18836](https://github.com/php/php-src/pull/18836/changes#diff-36685c80eb4c9b461c87f9f56845f1ad5f166f7e26d4e783b0511a1c670d8172R177) aliased, then [19636](https://github.com/php/php-src/pull/19636/changes#diff-80838f0d9bf6078a847dbafc2fff787d67013a7f19461cb6508246b5413fb4dfR900) added other aliases but also added the getFragment handler back without removing its alias, which left it unused. In this PR: - commit 1: drops alias to make handler used - commit 2: opposite of 1; drops unused handler Timeline-wise it seems the intention was adding the handler back, but I don't see why -- so I am once again removing it here. If instead making the handler used is preferred, I can drop commit 2.