tdf#118506: Disable orientation page in read only

Change-Id: I30994b95e65ddd70df7872f5cc41c339bf906f19
Reviewed-on: https://gerrit.libreoffice.org/56875
Tested-by: Jenkins
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>

svx/sdi/svx.sdi

@@ -6214,7 +6214,7 @@ SvxPageItem Orientation SID_ATTR_PAGE_ORIENTATION
 [
     AutoUpdate = FALSE,
     FastCall = FALSE,
-    ReadOnlyDoc = TRUE,
+    ReadOnlyDoc = FALSE,
     Toggle = FALSE,
     Container = FALSE,
     RecordAbsolute = FALSE,