Light analysis tests: do not render empty lines between classes and in the beginning

compiler/testData/codegen/light-analysis/objects/objectWithSuperclassAndTrait.txt

@@ -3,25 +3,21 @@ public class A {
     public method foo(): int
 }
 
-
 public final class O {
     public final static field INSTANCE: O
     private method <init>(): void
     public method foo(): int
 }
 
-
 public final class ObjectWithSuperclassAndTraitKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
-
 public interface T {
     inner class T/DefaultImpls
     public abstract method foo(): int
 }
 
-
 public final class T/DefaultImpls {
     inner class T/DefaultImpls
     public static method foo(p0: T): int