Specify existing extra size of WINEPS Devmode structure.
Make ExtDeviceMode16 in WINEPS return the correct size.

diff --git a/dlls/wineps/init.c b/dlls/wineps/init.c
index 8a38dd1..668f476 100644
--- a/dlls/wineps/init.c
+++ b/dlls/wineps/init.c
@@ -46,7 +46,7 @@
 /* dmSpecVersion */	0x30a,
 /* dmDriverVersion */	0x001,
 /* dmSize */		sizeof(DEVMODEA),
-/* dmDriverExtra */	0,
+/* dmDriverExtra */	sizeof(PSDRV_DEVMODEA)-sizeof(DEVMODEA),
 /* dmFields */		DM_ORIENTATION | DM_PAPERSIZE | DM_SCALE |
 			DM_COPIES | DM_DEFAULTSOURCE | DM_COLOR |
 			DM_DUPLEX | DM_YRESOLUTION | DM_TTOPTION,