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

compiler/testData/codegen/light-analysis/super/kt3492ClassProperty.txt

@@ -4,18 +4,15 @@ public class A {
     public @org.jetbrains.annotations.NotNull method getFoo(): java.lang.String
 }
 
-
 public class B {
     public method <init>(): void
 }
 
-
 public final class C {
     inner class C/D
     public method <init>(): void
 }
 
-
 public final class C/D {
     private final @org.jetbrains.annotations.NotNull field foo: java.lang.String
     synthetic final field this$0: C
@@ -24,7 +21,6 @@ public final class C/D {
     public final @org.jetbrains.annotations.NotNull method getFoo(): java.lang.String
 }
 
-
 public final class Kt3492ClassPropertyKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }