Light class codegen: all objects are considered static

Simplify code handling access flag computation
Fix a problem where kotlin nested object wasn't producing a nested light class

compiler/testData/codegen/light-analysis/objects/kt2398.txt

@@ -5,7 +5,7 @@ public final class C {
 }
 
 @kotlin.Metadata
-public final class C/Obj {
+public final static class C/Obj {
     public final static field INSTANCE: C.Obj
     private final static @org.jetbrains.annotations.NotNull field o: java.lang.String
     inner class C/Obj
@@ -25,7 +25,7 @@ public final static class C/Obj/D {
 }
 
 @kotlin.Metadata
-public final class C/Obj/InnerObj {
+public final static class C/Obj/InnerObj {
     public final static field INSTANCE: C.Obj.InnerObj
     inner class C/Obj
     inner class C/Obj/InnerObj

compiler/testData/codegen/light-analysis/objects/kt2675.txt

@@ -6,7 +6,7 @@ public final class A {
 }
 
 @kotlin.Metadata
-private final class A/Foo {
+private final static class A/Foo {
     public final static field INSTANCE: A.Foo
     private final static @org.jetbrains.annotations.NotNull field foov: java.lang.String
     inner class A/Foo
@@ -17,7 +17,7 @@ private final class A/Foo {
 }
 
 @kotlin.Metadata
-public final class A/Foo/Bar {
+public final static class A/Foo/Bar {
     public final static field INSTANCE: A.Foo.Bar
     private final static @org.jetbrains.annotations.NotNull field barv: java.lang.String
     inner class A/Foo

compiler/testData/codegen/light-analysis/objects/nestedObjectWithSuperclass.txt

@@ -19,7 +19,7 @@ public final class Outer {
 }
 
 @kotlin.Metadata
-public final class Outer/O {
+public final static class Outer/O {
     public final static field INSTANCE: Outer.O
     inner class Outer/O
     private method <init>(): void

compiler/testData/codegen/light-analysis/objects/privateFunctionFromClosureInInitializer_kt5582.txt

@@ -10,7 +10,7 @@ public final class Foo {
 }
 
 @kotlin.Metadata
-private final class Foo/O {
+private final static class Foo/O {
     public final static field INSTANCE: Foo.O
     inner class Foo/O
     private method <init>(): void