Fix agent scripted test.

Author: fehu

plugin/src/sbt-test/sbt-native-image/agent/build.sbt

@@ -4,7 +4,7 @@ lazy val example = project
     mainClass.in(Compile) := Some("example.Hello3"),
     nativeImageOptions ++= Seq(
       "--no-fallback",
-      s"-H:ReflectionConfigurationFiles=${ baseDirectory.value / "native-image-configs" / "reflect-config.json" }"
+      s"-H:ReflectionConfigurationFiles=${ target.value / "native-image-configs" / "reflect-config.json" }"
     ),
     nativeImageCommand := List(
       sys.env.getOrElse(