[MIRROR] move fbp to defines (#11332)

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
Co-authored-by: C.L. <killer65311@gmail.com>

code/modules/client/preference_setup/preference_setup.dm

@@ -243,11 +243,11 @@
 		return 0 // Not a robot.
 	if(O_BRAIN in pref.organ_data)
 		switch(pref.organ_data[O_BRAIN])
-			if("assisted")
+			if(FBP_ASSISTED)
 				return PREF_FBP_CYBORG
-			if("mechanical")
+			if(FBP_MECHANICAL)
 				return PREF_FBP_POSI
-			if("digital")
+			if(FBP_DIGITAL)
 				return PREF_FBP_SOFTWARE
 	return 0 //Something went wrong!