Fix traversing jar files with tasty inspector

Author: BarkingBad

compiler/src/dotty/tools/dotc/fromtasty/TASTYRun.scala

@@ -18,6 +18,7 @@ class TASTYRun(comp: Compiler, ictx: Context) extends Run(comp, ictx) {
       file.extension match
         case "jar" =>
           JarArchive.open(Path(file.path), create = false).allFileNames()
+            .map(_.stripPrefix("/")) // change paths from absolute to relative
             .filter(e => Path.extension(e) == "tasty" && !fromTastyIgnoreList(e))
             .map(e => e.stripSuffix(".tasty").replace("/", "."))
             .toList