rna api - replace panel properties bl_default_closed and bl_show_header with bl_options which has 2 flags: 'DEFAULT_CLOSED' and 'HIDE_HEADER'.

this matches operators which also uses bl_options like this

release/scripts/ui/properties_data_armature_rigify.py

@@ -38,7 +38,7 @@ class DATA_PT_template(bpy.types.Panel):
     bl_space_type = 'PROPERTIES'
     bl_region_type = 'WINDOW'
     bl_context = "data"
-    bl_default_closed = True
+    bl_options = {'DEFAULT_CLOSED'}
 
     templates = []