EGA also supported 32K

lines 194-205 appear to cover the memory window setting.

src/video/vid_ega.c

@@ -1168,6 +1168,9 @@ static const device_config_t ega_config[] =
         {
                 "memory", "Memory size", CONFIG_SELECTION, "", 256, "", { 0 },
                 {
+                        {
+                                "32 kB", 32
+                        },
                         {
                                 "64 kB", 64
                         },