Remove migrated rocket-info from exp_legacy

The rocket info gui and its control module now live in
exp_scenario/gui/rocket_info, so delete the orphaned legacy files and
drop the disabled file loader entry.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

exp_legacy/module/config/_file_loader.lua

@@ -22,7 +22,6 @@ return {
     --"modules.data.toolbar",
 
     --- GUI
-    -- "modules.gui.rocket-info", -- migrated to exp_scenario/gui/rocket_info
     "modules.gui.warp-list",
     "modules.gui.player-list",
     "modules.gui.vlayer",