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

compiler/testData/codegen/light-analysis/classes/kt2224.txt

@@ -2,13 +2,11 @@ public interface A {
     public abstract method foo(): int
 }
 
-
 public final class B1 {
     public method <init>(): void
     public method foo(): int
 }
 
-
 public final class B2 {
     private final field z: int
     public method <init>(p0: int): void
@@ -16,7 +14,6 @@ public final class B2 {
     public final method getZ(): int
 }
 
-
 public final class Kt2224Kt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
     public final static method f1(@org.jetbrains.annotations.NotNull p0: B1): int