Configuration: stopped automatic migration to the "share" behavior.

This commit removed the $uri auto-append for the "share" option
introduced in rev be6409cdb028.

The main reason is that it causes problems when preparing Unit configurations
to be loaded at startup from the state directory. E.g. Docker. A valid conf.json
file with $uri references will end up with $uri$uri due to the auto-append.

docs/changes.xml

@@ -31,6 +31,12 @@ NGINX Unit updated to 1.29.0.
          date="" time=""
          packager="Nginx Packaging <nginx-packaging@f5.com>">
 
+<change type="change">
+<para>
+removed $uri auto-append for "share" when loading configuration.
+</para>
+</change>
+
 <change type="feature">
 <para>
 compatibility with PHP 8.2.