[codegen] testData: add missing directory structure for Java classes

compiler/testData/codegen/box/callableReference/function/dispatchReceiverType.kt

@@ -1,13 +1,13 @@
 // TARGET_BACKEND: JVM
 // MODULE: lib
-// FILE: X.java
+// FILE: test/X.java
 package test;
 
 public class X extends PX {
     public X(String x) { super(x); }
 }
 
-// FILE: PX.java
+// FILE: test/PX.java
 package test;
 
 class PX {

compiler/testData/codegen/box/javaVisibility/package/publicInterfaceImplementedByPackagePrivateClass.kt

@@ -1,13 +1,13 @@
 // TARGET_BACKEND: JVM_IR
 // MODULE: lib
-// FILE: I.java
+// FILE: test/I.java
 package test;
 
 public interface I {
     String foo();
 }
 
-// FILE: J.java
+// FILE: test/J.java
 package test;
 
 class JBase<T> {
@@ -16,7 +16,7 @@ class JBase<T> {
 
 public class J extends JBase<String> {}
 
-// FILE: JImpl.java
+// FILE: test/JImpl.java
 package test;
 
 public class JImpl {

compiler/testData/codegen/box/notNullAssertions/doGenerateParamAssertions.kt

@@ -1,7 +1,7 @@
 // TARGET_BACKEND: JVM
 // DISABLE_CALL_ASSERTIONS
 // MODULE: lib
-// FILE: C.java
+// FILE: test/C.java
 package test;
 
 import org.jetbrains.annotations.NotNull;