[no GBP] Wheelchair Bomb Fixes (#90440)

## About The Pull Request

Two nitpicks and one fix from #90176 which were posted post-merge.
Main thing is that the wheelchair will no longer delete bells/TTVs when
folded, other things are just code cleanup.

## Changelog

🆑
fix: Folding a wheelchair will no longer destroy attached bells or
bombs.
/🆑

code/modules/vehicles/motorized_wheelchair.dm

@@ -185,7 +185,7 @@
 /obj/vehicle/ridden/wheelchair/motorized/Bump(atom/bumped_atom)
 	. = ..()
 	// Here is the shitty emag functionality.
-	if(obj_flags & EMAGGED && (isclosedturf(bumped_atom) || isliving(bumped_atom)))
+	if((obj_flags & EMAGGED) && (isclosedturf(bumped_atom) || isliving(bumped_atom)))
 		detonate_bomb()
 		return
 	// If the speed is higher than delay_multiplier throw the person on the wheelchair away

code/modules/vehicles/wheelchair.dm

@@ -61,7 +61,7 @@
 /// When you ring your bell and are armed try to explode
 /obj/vehicle/ridden/wheelchair/proc/on_bell_rang()
 	SIGNAL_HANDLER
-	if (!prob(20))
+	if (prob(80))
 		return
 	detonate_bomb()
 
@@ -71,7 +71,7 @@
 	if(!tool.use_tool(src, user, 4 SECONDS, volume=50))
 		return ITEM_INTERACT_SUCCESS
 	to_chat(user, span_notice("You detach the wheels and deconstruct the chair."))
-	deconstruct(TRUE)
+	deconstruct(disassembled = TRUE)
 	qdel(src)
 	return ITEM_INTERACT_SUCCESS
 
@@ -99,6 +99,8 @@
 		return FALSE
 	if(has_buckled_mobs())
 		return FALSE
+	remove_bell()
+	remove_bomb()
 	user.visible_message(span_notice("[user] collapses [src]."), span_notice("You collapse [src]."))
 	var/obj/vehicle/ridden/wheelchair/wheelchair_folded = new foldabletype(get_turf(src))
 	user.put_in_hands(wheelchair_folded)