fix zinc after rebase

Author: bishabosha

scalalib/worker/src/mill/scalalib/worker/ZincWorkerImpl.scala

@@ -683,7 +683,7 @@ object ZincWorkerImpl {
           val lines = str.linesWithSeparators.toVector
           val adjustedFile = lines
             .collectFirst { case s"//MILL_ORIGINAL_FILE_PATH=$rest" => rest.trim }
-            .getOrElse(sys.error(p.toString))
+            .getOrElse(sys.error(vf.id()))
 
           vf.id() -> remap(lines, adjustedFile)
         })