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

compiler/testData/codegen/light-analysis/dataClasses/nonTrivialMemberInSuperClass.txt

@@ -5,7 +5,6 @@ public abstract class Base {
     public @org.jetbrains.annotations.NotNull method toString(): java.lang.String
 }
 
-
 public final class DataClass {
     private final @org.jetbrains.annotations.NotNull field field: java.lang.String
     public method <init>(@org.jetbrains.annotations.NotNull p0: java.lang.String): void
@@ -18,7 +17,6 @@ public final class DataClass {
     public method toString(): java.lang.String
 }
 
-
 public final class NonTrivialMemberInSuperClassKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }