fix(config): restore cachyos-tricks site to its documented overrides category

The site was mistagged aliases/filesystem in the prior commit. The original
code's own comment above the guarded block ("Surgically overriding the
distro config is opinionated (C3 overrides): skip it entirely when
overrides are disabled") documents this as an overrides decision, and it
gated __fish_config_op_overrides pre-migration. Retag to
overrides/environment (matching tricks.fish's own sibling site for the
equivalent action) so aliases=on/overrides=off keeps skipping
tricks.fish/ls/lt/cleanup/copy, as originally documented -- no silent
user-facing behavior change.

conf.d/__fish_config_op_registry.fish

@@ -87,7 +87,7 @@ set -g __fish_config_op_registry_values \
     "aliases/dev-tools" \
     "aliases/filesystem" \
     "overrides/key-bindings" \
-    "aliases/filesystem" \
+    "overrides/environment" \
     "overrides/environment" \
     "overrides/key-bindings" \
     "greeting/greeting-message" \