Related: tdf#161599 ChildAccess::asValue() must return Reference<XInterface>

... otherwise the unotools/source/config/configitem.cxx
ConfigItem::impl_packLocalizedProperties() checking for
(getValueTypeName() == "com.sun.star.uno.XInterface") would not
hit and thus not pack the properties, returning just the useless
XWeak pointer as property.

This in ScUnoAddInCollection::ReadConfiguration() lead to English
names not being extracted from configured Add-Ins' DisplayName or
CompatibilityName, nor any CompatibilityName added to the list.

Fallout from

    commit bc70f674c2487ad826f8fe04e626de1829f5b40d
    CommitDate: Sun Jun 18 08:41:27 2023 +0200

        Use getXWeak in configmgr

Change-Id: Ibaab8c08a06113b27ceffe1c45ef548c1d6fa225
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172476
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins

configmgr/source/childaccess.cxx

@@ -245,7 +245,7 @@ css::uno::Any ChildAccess::asValue()
                 return child.is() ? child->asValue() : css::uno::Any();
             }
         }
-        value <<= css::uno::Reference(getXWeak());
+        value <<= css::uno::Reference< css::uno::XInterface >(getXWeak());
     }
     return value;
 }