fix namespace pref lists and add a reset button

2.1.3

- fixed: decoralate Prefix and Suffix UI_lists scroll
- fixed: Problem when settings project namespaces
- added: Button to reset project namespace (to have the right order)

properties.py

@@ -243,7 +243,6 @@ class GP_PG_namespace_props(PropertyGroup):
 
 class GP_PG_namespaces(PropertyGroup):
     idx : IntProperty(default=-1)
-
     namespaces : bpy.props.CollectionProperty(type=GP_PG_namespace_props)
 
 classes = (