[NO GBP] fixes issues with human rendering fixes (#82852)

## About The Pull Request
fixes #82838, forgot to add the attack_self there
fixes #82869
fixes the atmos hardhat not using flags_inv and transparent_protection
correctly (you could pull off someones glasses through it for example
makes modsuits use the new rendering stuff
fixes rendering stuff not working correctly with adjustable clothing
fixes quick equip dropping the item if you cant equip it

## Why It's Good For The Game
waow its awesome

## Changelog
🆑
fix: you can no longer take off someones glasses or mask through atmos
hardhat
fix: once you adjust a welding helmet or something it no longer makes
your cigarette or sunglasses invisible
fix: welding gas mask works once again
fix: quick equips dont drop the item if you cant equip it
/🆑

code/modules/mining/equipment/explorer_gear.dm

@@ -91,7 +91,6 @@
 	. = ..()
 	// adjusted = out of the way = smaller = can fit in boxes
 	update_weight_class(up ? WEIGHT_CLASS_SMALL : WEIGHT_CLASS_NORMAL)
-	inhand_icon_state = up ? "[initial(inhand_icon_state)]_up" : initial(inhand_icon_state)
 
 /obj/item/clothing/mask/gas/explorer/update_icon_state()
 	. = ..()