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

compiler/testData/codegen/light-analysis/operatorConventions/incDecOnObject.txt

@@ -4,7 +4,6 @@ public final class IncDecOnObjectKt {
     public final static @org.jetbrains.annotations.NotNull method inc(@org.jetbrains.annotations.NotNull p0: X): X
 }
 
-
 public final class X {
     private field value: long
     public method <init>(p0: long): void
@@ -12,7 +11,6 @@ public final class X {
     public final method setValue(p0: long): void
 }
 
-
 public final class Z {
     private field counter: int
     private @org.jetbrains.annotations.NotNull field prop: X