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

compiler/testData/codegen/light-analysis/dataClasses/copy/withGenericParameter.txt

@@ -10,14 +10,12 @@ public final class A {
     public method toString(): java.lang.String
 }
 
-
 public final class Foo {
     private final field a: java.lang.Object
     public method <init>(p0: java.lang.Object): void
     public final method getA(): java.lang.Object
 }
 
-
 public final class WithGenericParameterKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }