gmoccapy: fix unit in pyngcgui sample

Author: hansu

configs/sim/gmoccapy/gmoccapy_pyngcgui.ini

@@ -25,7 +25,7 @@ EMBED_TAB_LOCATION = ntb_user_tabs
 #   noiframe   -- no internal image, image  on separate toplevel
 #   nom2       -- no m2 terminator (use %)
 # these are interpreted by touchy:
-NGCGUI_PREAMBLE   = in_std.ngc
+NGCGUI_PREAMBLE   = mm_std.ngc
 NGCGUI_SUBFILE    = arc1.ngc
 NGCGUI_SUBFILE    = arc2.ngc
 NGCGUI_SUBFILE    = qpocket.ngc