fix all blind texts being dark

[nnmrts]

Problem

The loc_colour override only accepts a single parameter (key), but the vanilla function signature is loc_colour(_c, _default). When the override forwards to the original function via loc_colour_ref(key), the _default parameter is silently dropped.

The localization text parser calls loc_colour(nil, args.default_col) for text segments without an explicit color code. Without the default being forwarded, the vanilla function falls through to G.C.UI.TEXT_DARK (#4F6367) instead of the caller's intended default color.

This causes any localized text relying on the default color to render as dark gray instead of the expected color. Most visibly, blind description text, making it unreadable against the dark background.

Fix

Forward the _default parameter through the override to loc_colour_ref.