Java to Kotlin converter: "//file" in test data has made optional

j2k/tests/testData/ast/comments/comments.java

@@ -1,4 +1,3 @@
-//file
 package foo; // we use package 'foo'
 
 // imports:

j2k/tests/testData/ast/comments/comments2.java

@@ -1,4 +1,3 @@
-//file
 package foo;
 
 class A {

j2k/tests/testData/ast/comments/commentsForConstructors.java

@@ -1,4 +1,3 @@
-//file
 class A {
     private int v;
 

j2k/tests/testData/ast/comments/fieldWithEndOfLineComment.java

@@ -1,4 +1,3 @@
-//file
 class A {
     private boolean isOpen = true; // ideally should be atomic boolean
 }

j2k/tests/testData/ast/comments/fieldsInitializedFromParams.java

@@ -1,4 +1,3 @@
-//file
 class C {
     private final int p1; // field p1