Revert MC-101556

Reverts the "fix" for MC-101556 (only affects 1.21.5).

Makes nether portals/chunk loaders work properly again.

Please note that the "fix" for MC-101556 was reverted by Mojang in 25w16a (1.21.6) and the mod is no longer required in these versions.

The mod itself is extremely minimalistic and only a single line of code was patched.