[Test] Replace public fun box() with fun box() in all box tests

compiler/testData/codegen/box/increment/assignPlusOnSmartCast.kt

@@ -1,4 +1,4 @@
-public fun box() : String {
+fun box() : String {
     var i : Int?
     i = 10
     // assignPlus on a smart cast should work

compiler/testData/codegen/box/increment/postfixIncrementDoubleSmartCast.kt

@@ -1,4 +1,4 @@
-public fun box() : String {
+fun box() : String {
     var i : Int?
     i = 10
     // We have "double" smart cast here:

compiler/testData/codegen/box/increment/postfixIncrementOnClass.kt

@@ -3,7 +3,7 @@ class Derived: Base
 class Another: Base
 operator fun Base.inc(): Derived { return Derived() }
 
-public fun box() : String {
+fun box() : String {
     var i : Base
     i = Another()
     val j = i++

compiler/testData/codegen/box/increment/postfixIncrementOnClassSmartCast.kt

@@ -2,7 +2,7 @@ open class Base
 class Derived: Base()
 operator fun Derived.inc(): Derived { return Derived() }
 
-public fun box() : String {
+fun box() : String {
     var i : Base
     i = Derived()
     val j = i++

compiler/testData/codegen/box/increment/postfixIncrementOnShortSmartCast.kt

@@ -1,4 +1,4 @@
-public fun box() : String {
+fun box() : String {
     var i : Short?
     i = 10
     // Postfix increment on a smart casted short should work

compiler/testData/codegen/box/increment/postfixIncrementOnSmartCast.kt

@@ -1,4 +1,4 @@
-public fun box() : String {
+fun box() : String {
     var i : Int?
     i = 10
     // Postfix increment on a smart cast should work

compiler/testData/codegen/box/increment/postfixNullableClassIncrement.kt

@@ -2,7 +2,7 @@ class MyClass
 
 operator fun MyClass?.inc(): MyClass? = null
 
-public fun box() : String {
+fun box() : String {
     var i : MyClass? 
     i = MyClass()
     val j = i++

compiler/testData/codegen/box/increment/postfixNullableIncrement.kt

@@ -2,7 +2,7 @@ operator fun Int?.inc(): Int? = this
 
 fun init(): Int? { return 10 }
 
-public fun box() : String {
+fun box() : String {
     var i : Int? = init()
     val j = i++
 

compiler/testData/codegen/box/increment/prefixIncrementOnClass.kt

@@ -3,7 +3,7 @@ class Derived: Base
 class Another: Base
 operator fun Base.inc(): Derived { return Derived() }
 
-public fun box() : String {
+fun box() : String {
     var i : Base
     i = Another()
     val j = ++i

compiler/testData/codegen/box/increment/prefixIncrementOnClassSmartCast.kt

@@ -2,7 +2,7 @@ open class Base
 class Derived: Base()
 operator fun Derived.inc(): Derived { return Derived() }
 
-public fun box() : String {
+fun box() : String {
     var i : Base
     i = Derived()
     val j = ++i

compiler/testData/codegen/box/increment/prefixIncrementOnSmartCast.kt

@@ -1,4 +1,4 @@
-public fun box() : String {
+fun box() : String {
     var i : Int?
     i = 10
     // Prefix increment on a smart cast should work

compiler/testData/codegen/box/increment/prefixNullableClassIncrement.kt

@@ -2,7 +2,7 @@ class MyClass
 
 operator fun MyClass?.inc(): MyClass? = null
 
-public fun box() : String {
+fun box() : String {
     var i : MyClass? 
     i = MyClass()
     val j = ++i

compiler/testData/codegen/box/increment/prefixNullableIncrement.kt

@@ -2,7 +2,7 @@ operator fun Int?.inc(): Int? = this
 
 fun init(): Int? { return 10 }
 
-public fun box() : String {
+fun box() : String {
     var i : Int? = init()
     val j = ++i