Next attempt to fix ./mill init example downloads (#5380)

Resolves #5238

Author: lihaoyi

dist/package.mill

@@ -253,7 +253,7 @@ object `package` extends MillJavaModule with DistModule {
   def publishArtifacts = Task {
     super.publishArtifacts().copy(payload =
       super.publishArtifacts().payload ++
-        exampleZips().map(z => (z, s"${artifactFileNamePrefix()}-${z.path.last}")) ++
+        exampleZips().map(z => (z, z.path.last)) ++
         Seq(
           (bootstrapLauncher(), s"${artifactFileNamePrefix()}-mill.sh"),
           (bootstrapLauncherBat(), s"${artifactFileNamePrefix()}-mill.bat")