chore: revert uneffective code for encoding of page title

[rob006]

This PR effectively reverts #3542 and #3684, as both these fixes does not work correctly seems to bring more harm than good. The real issue is described in #3685 and it should be fixed on trans() level.

Use case:

1. Set forum title to Flarum & Flarum.
2. Create new discussion with title & & & test.

Before this PR title displayed in browser tab would be: & & & test - Flarum & Flarum.
After this PR: & & & test - Flarum & Flarum.
Correct title should be: & & & test - Flarum & Flarum.

While this PR does not fix issue completely, it makes things better. Currently even on Discuss some discussions have incorrectly encoded title:

Necessity

• Has the problem that is being solved here been clearly explained?
• If applicable, have various options for solving this problem been considered?
• For core PRs, does this need to be in core, or could it be in an extension?
• Are we willing to maintain this for years / potentially forever?

Confirmed

• Frontend changes: tested on a local Flarum installation.
• Backend changes: tests are green (run composer test).
• Core developer confirmed locally this works as intended.
• Tests have been added, or are not appropriate here.

Required changes:

• Related documentation PR: (Remove if irrelevant)
• Related core extension PRs: (Remove if irrelevant)

[SychO9]

I would have sworn the last PR fixed this for good with the title, but considering the source of the issue is elsewhere, it would be better fixed there.