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

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

@@ -4,13 +4,11 @@ public final class A {
     public method <init>(): void
 }
 
-
 public final static class A/Companion {
     inner class A/Companion
     private method <init>(): void
 }
 
-
 public final class ClassObjectAsExtensionReceiverKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
     public final static method foo(@org.jetbrains.annotations.NotNull p0: java.lang.Object): int