Reverts the second mob clean up because of incomplete implementation.

This caused an error that would then cause machinery to hang on the server, and was reproduced successfully.

code/modules/assembly/bomb.dm

@@ -86,7 +86,7 @@
 	var/obj/item/device/onetankbomb/R = new /obj/item/device/onetankbomb(loc)
 
 	M.drop_item()			//Remove the assembly from your hands
-	M.removeItem(src)	//Remove the tank from your character,in case you were holding it
+	M.remove_from_mob(src)	//Remove the tank from your character,in case you were holding it
 	M.put_in_hands(R)		//Equips the bomb if possible, or puts it on the floor.
 
 	R.bombassembly = S	//Tell the bomb about its assembly part

code/modules/assembly/holder.dm

@@ -36,8 +36,8 @@
 		if((!isassembly(D))||(!isassembly(D2)))	return 0
 		if((D:secured)||(D2:secured))	return 0
 		if(user)
-			user.removeItem(D)
-			user.removeItem(D2)
+			user.remove_from_mob(D)
+			user.remove_from_mob(D2)
 		D:holder = src
 		D2:holder = src
 		D.loc = src