Ups pickup hotkey memory to 5 (#11878)

# About the pull request

title

# Explain why it's good for the game

Sometimes you need to pickup an item you dropped but it goes out of your
memory, with macroes this used be simple but they're removed now, any
items you intentionally mean to throw away are either rare enough where
its not an issue, or are empty mags which are usually just auto-ejected
onto the ground anyway.


# Testing Photographs and Procedure



# Changelog
:cl: Riot
add: Pickup hotkey has a memory of 5 items now
/:cl:

Author: CapCamIII

code/__DEFINES/human.dm

@@ -221,4 +221,4 @@
 #define RELIGION_ATHEISM "Atheism"
 #define RELIGION_AGNOSTICISM "Agnostic"
 
-#define MAXIMUM_DROPPED_OBJECTS_REMEMBERED 2
+#define MAXIMUM_DROPPED_OBJECTS_REMEMBERED 5