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

compiler/testData/codegen/light-analysis/labels/labeledDeclarations.txt

@@ -13,7 +13,6 @@ public final class A {
     public method toString(): java.lang.String
 }
 
-
 public final class LabeledDeclarationsKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }

compiler/testData/codegen/light-analysis/labels/propertyAccessorObject.txt

@@ -2,7 +2,6 @@ public interface Base {
     public abstract method foo(): int
 }
 
-
 public final class PropertyAccessorObjectKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
     public final static method getGetter(p0: int): int

compiler/testData/codegen/light-analysis/labels/propertyInClassAccessor.txt

@@ -2,7 +2,6 @@ public final class PropertyInClassAccessorKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
-
 public final class Test {
     public method <init>(): void
     public final method getInnerGetter(p0: int): int