Small wide/dog borg tweaks/fixes

-Adds a new var to specify nonstandard borg sprite sizes. No longer dogborg exclusive.
-Makes the dogborg var usable for standard sizes as well (for the special features like rest poses and gun/gut overlays)
-Makes the borg reset module reset the forementioned vars.
-Excludes wideborg from the standard size polaris/vore vr_sprite_check to avoid unintended default file reverts.

code/game/objects/items/robot/robot_upgrades.dm

@@ -28,6 +28,8 @@
 	if(..()) return 0
 	R.pixel_x = initial(pixel_x) //VOREStation Edit
 	R.pixel_y = initial(pixel_y) //VOREStation Edit
+	R.dogborg = FALSE //VOREStation Edit
+	R.wideborg = FALSE //VOREStation Edit
 	R.uneq_all()
 	R.modtype = initial(R.modtype)
 	R.hands.icon_state = initial(R.hands.icon_state)