Should fix the loadout-box-killing runtime (#3164)

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## About The Pull Request

invalid items in loadout = runtime = no box
This should remove any loadout items that don't exist before they can
try to exist (they won't)

## Why It's Good For The Game

uhm box

## Changelog

:cl:
fix: loadout boxes will no longer sometimes not spawn
/:cl:

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Signed-off-by: Theos <[email protected]>

code/modules/client/preferences_savefile.dm

@@ -448,9 +448,15 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	READ_FILE(S["equipped_gear"], equipped_gear)
 	if(config) //This should *probably* always be there, but just in case.
 		if(length(equipped_gear) > CONFIG_GET(number/max_loadout_items))
-			to_chat(parent, "<span class='userdanger'>Loadout maximum items exceeded in loaded slot, Your loadout has been cleared! You had [length(equipped_gear)]/[CONFIG_GET(number/max_loadout_items)] equipped items!</span>")
+			to_chat(parent, span_userdanger("Loadout maximum items exceeded in loaded slot, Your loadout has been cleared! You had [length(equipped_gear)]/[CONFIG_GET(number/max_loadout_items)] equipped items!"))
 			equipped_gear = list()
-			WRITE_FILE(S["equipped_gear"]				, equipped_gear)
+			WRITE_FILE(S["equipped_gear"], equipped_gear)
+
+	for(var/gear in equipped_gear)
+		if(!(gear in GLOB.gear_datums))
+			to_chat(parent, span_warning("Removing nonvalid loadout item [gear] from loadout"))
+			equipped_gear -= gear //be GONE
+			WRITE_FILE(S["equipped_gear"], equipped_gear)
 
 	READ_FILE(S["feature_human_tail"], features["tail_human"])
 	READ_FILE(S["feature_human_ears"], features["ears"])