Removed redundant main from tests

backend.native/tests/external/codegen/box/arrays/kt4348.kt

@@ -5,9 +5,6 @@ operator fun String.get(vararg value: Any) : String {
 operator fun Int.get(vararg value: Any) : Int {
     return if (value[0] == 44 && value[1] == "example") 1 else 0
 }
-fun main(args: Array<String>) {
-    12  [44, "example"]
-}
 
 fun box(): String {
     if ("foo" [44, "example"] != "OK") return "fail1"

backend.native/tests/external/codegen/box/bridges/kt1959.kt

@@ -6,8 +6,7 @@ class B(): A<String>() {
     override fun f(args : Array<String>) {}
 }
 
-fun main(args: Array<String>) {
+fun box(): String {
     B()
-}
-
-fun box(): String = "OK"
+    return "OK"
+}

backend.native/tests/external/codegen/box/controlStructures/kt2259.kt

@@ -1,4 +1,4 @@
-fun main(args: Array<String>) {
+fun foo(args: Array<String>) {
     try {
     } finally {
         try {

backend.native/tests/external/codegen/box/localClasses/kt2873.kt

@@ -6,10 +6,6 @@ fun foo() : String {
     return u()
 }
 
-fun main(args: Array<String>) {
-    foo()
-}
-
 fun box(): String {
   return foo()
 }

backend.native/tests/external/codegen/box/when/enumOptimization/kt14597_full.kt

@@ -1,9 +1,5 @@
 enum class En { A, B, С }
 
-fun main(args: Array<String>) {
-
-}
-
 fun box(): String {
     var res1 = "fail"
     var res2 = "fail2"