Revert "Revert "pls""

This reverts commit b23f2a4460.

code/modules/keybindings/bindings_carbon.dm

@@ -15,7 +15,4 @@
 		if("4")
 			a_intent_change("harm")
 			return
-		if("C")
-			toggle_combat_mode()
-			return
 	return ..()

code/modules/keybindings/bindings_human.dm

@@ -56,15 +56,4 @@
 					return
 				stored.attack_hand(src) // take out thing from backpack
 				return
-	switch(_key)
-		if("Shift")
-			sprint_hotkey(TRUE)
-			return
-	return ..()
-
-/mob/living/carbon/human/key_up(_key, client/user)
-	switch(_key)
-		if("Shift")
-			sprint_hotkey(FALSE)
-			return
-	return ..()
+	return ..()

code/modules/keybindings/bindings_robot.dm

@@ -9,14 +9,4 @@
 		if("Q")
 			uneq_active()
 			return
-		if("Shift")
-			sprint_hotkey(TRUE)
-			return
-	return ..()
-
-/mob/living/silicon/robot/key_up(_key, client/user)
-	switch(_key)
-		if("Shift")
-			sprint_hotkey(FALSE)
-			return
-	return ..()
+	return ..()