Wheelchair broken hand move delay standardazation (#6720)

# About the pull request

having right hand broken added more slowdown to wheelchair then left
one, gets both the same

# Explain why it's good for the game

oversight fix


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

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screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
fix: having left hand broken and not splinted has the same effect on
wheelchair movement speed as right hand
/:cl:

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Co-authored-by: vincibrv <[email protected]>

code/game/objects/structures/stool_bed_chair_nest/wheelchair.dm

@@ -36,12 +36,12 @@
 			move_delay += 4 //harder to move a wheelchair with a single hand
 			working_hands--
 		else if((left_hand.status & LIMB_BROKEN) && !(left_hand.status & LIMB_SPLINTED))
-			move_delay++
+			move_delay ++
 		if(!right_hand || (right_hand.status & LIMB_DESTROYED))
 			move_delay += 4
 			working_hands--
 		else if((right_hand.status & LIMB_BROKEN) && !(right_hand.status & LIMB_SPLINTED))
-			move_delay += 2
+			move_delay++
 		if(!working_hands)
 			return // No hands to drive your chair? Tough luck!
 		if(driver.pulling && driver.pulling.drag_delay && driver.get_pull_miltiplier()) //Dragging stuff can slow you down a bit.