userdef_defaults for 'Render In' and 'File Browser'

Otherwise --factory-startup would e.g render as `Keep User Interface`
(which is supposed to be `New Window` by default)

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5851

release/datafiles/userdef/userdef_default.c

@@ -183,6 +183,8 @@ const UserDef U_default = {
     .opensubdiv_compute_type = 0,
     .gpencil_multisamples = 4,
     .factor_display_type = USER_FACTOR_AS_FACTOR,
+    .render_display_type = USER_RENDER_DISPLAY_WINDOW,
+    .filebrowser_display_type = USER_TEMP_SPACE_DISPLAY_WINDOW,
     .viewport_aa = 8,
 
     .walk_navigation =