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

compiler/testData/codegen/light-analysis/defaultArguments/function/covariantOverrideGeneric.txt

@@ -4,12 +4,10 @@ public final class Bar {
     public synthetic method foo(p0: java.lang.CharSequence): java.lang.CharSequence
 }
 
-
 public final class CovariantOverrideGenericKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
-
 public class Foo {
     public method <init>(): void
     public synthetic static method foo$default(p0: Foo, p1: java.lang.CharSequence, p2: int, p3: java.lang.Object): java.lang.CharSequence