Restore SbtFile and null guards in JVM sourceFiles match

Lost during Run.scala restructure for Wasm: restores the original
case _: SbtFile => "" and case null => "" branches so SbtFile inputs
are properly filtered from scala.sources JVM property.

Author: lostflydev

modules/cli/src/main/scala/scala/cli/commands/run/Run.scala

@@ -677,8 +677,9 @@ object Run extends ScalaCommand[RunOptions] with BuildCommandHelpers {
                       case s: ScalaFile    => fwd(s.path.toString)
                       case s: Script       => fwd(s.path.toString)
                       case s: MarkdownFile => fwd(s.path.toString)
+                      case _: SbtFile      => ""
                       case s: OnDisk       => fwd(s.path.toString)
-                      case s               => s.getClass.getName
+                      case null            => ""
                     }.filter(_.nonEmpty).distinct
                     val sources     = sourceFiles.mkString(File.pathSeparator)
                     val sourceNames = sourceFiles.map(base).mkString(File.pathSeparator)