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

compiler/testData/codegen/light-analysis/properties/kt8928.txt

@@ -6,7 +6,6 @@ public final class App {
     public final method init(): void
 }
 
-
 public final static class App/Companion {
     inner class App/Companion
     private method <init>(): void
@@ -14,7 +13,6 @@ public final static class App/Companion {
     private final method setS(p0: java.lang.String): void
 }
 
-
 public final class Kt8928Kt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }