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

compiler/testData/codegen/light-analysis/when/sealedWhenInitialization.txt

@@ -4,20 +4,17 @@ public abstract class A {
     private method <init>(): void
 }
 
-
 public final class A/B {
     public final static field INSTANCE: A.B
     inner class A/B
     private method <init>(): void
 }
 
-
 public final static class A/C {
     inner class A/C
     public method <init>(): void
 }
 
-
 public final class SealedWhenInitializationKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }