UNG code contains overrides of default ERP5 UI and KM UI which breaks it so...

UNG code contains overrides of default ERP5 UI and KM UI which breaks it so add theme to its default skin selection (same way as KM).

bt5/erp5_web_ung_theme/RegisteredSkinSelectionTemplateItem/registered_skin_selection.xml

+<registered_skin_selection>
+ <skin_folder_selection>
+  <skin_folder>erp5_web_ung_theme</skin_folder>
+  <skin_selection>UNGDoc</skin_selection>
+ </skin_folder_selection>
+</registered_skin_selection>
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bt5/erp5_web_ung_theme/bt/revision

-374
+375
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bt5/erp5_web_ung_theme/bt/template_registered_skin_selection_list

+erp5_web_ung_theme | UNGDoc
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