Fix regression with extension methods not being shown in searchbar

An error was introduced in 598b8d3
that made it so that some methods were unnecesarily ommited from the
searching function.

Author: jchyb

scaladoc/src/dotty/tools/scaladoc/renderers/Resources.scala

@@ -151,7 +151,7 @@ trait Resources(using ctx: DocContext) extends Locations, Writer:
             val entry = mkEntry(member.dri, member.name, flattenToText(sig), descr, member.kind.name)
             val children = member
                 .membersBy(m => m.kind != Kind.Package && !m.kind.isInstanceOf[Classlike])
-                .filter(m => m.origin == Origin.RegularlyDefined && m.inheritedFrom.fold(false)(_.isSourceSuperclassHidden))
+                .filter(m => m.origin == Origin.RegularlyDefined && m.inheritedFrom.fold(true)(_.isSourceSuperclassHidden))
             Seq(entry) ++ children.flatMap(processMember)
 
           processMember(m)