Migrate testdata to new lambda syntax

compiler/testData/codegen/box/closures/closureInsideClosure/varAsFunInsideLocalFun.kt

@@ -2,7 +2,7 @@
 
 fun box(): String {
     fun rec(n : Int) {
-        val x = { (m : Int) ->
+        val x = { m : Int ->
             if (n > 0) rec(n - 1)
         }
 

compiler/testData/codegen/box/closures/closureWithParameter.kt

@@ -1,5 +1,5 @@
 fun box() : String {
-    return apply( "OK", {(arg: String) -> arg } )
+    return apply( "OK", {arg: String -> arg } )
 }
 
 fun apply(arg : String, f :  (p:String) -> String) : String {

compiler/testData/codegen/box/closures/closureWithParameterAndBoxing.kt

@@ -1,5 +1,5 @@
 fun box() : String {
-    return if (apply( 5, {(arg: Int) -> arg + 13 } ) == 18) "OK" else "fail"
+    return if (apply( 5, {arg: Int -> arg + 13 } ) == 18) "OK" else "fail"
 }
 
 fun apply(arg : Int, f :  (p:Int) -> Int) : Int {

compiler/testData/codegen/box/closures/enclosingThis.kt

@@ -1,6 +1,6 @@
 class Point(val x:Int, val y:Int) {
     fun mul() :  (scalar:Int)->Point  {
-        return { (scalar:Int):Point -> Point(x * scalar, y * scalar) }
+        return { scalar:Int -> Point(x * scalar, y * scalar) }
     }
 }
 

compiler/testData/codegen/box/closures/extensionClosure.kt

@@ -1,7 +1,7 @@
 class Point(val x : Int, val y : Int)
 
 fun box() : String {
-    val answer = apply(Point(3, 5), { Point.(scalar : Int) : Point ->
+    val answer = apply(Point(3, 5), { scalar : Int ->
         Point(x * scalar, y * scalar)
     })
 

compiler/testData/codegen/box/closures/localReturn.kt

@@ -1,13 +1,13 @@
 fun box(): String {
     val a = 1
-    val explicitlyReturned = run1 @f{(): String ->
+    val explicitlyReturned = run1 @f{
         if (a > 0)
           return@f "OK"
         else "Fail 1"
     }
     if (explicitlyReturned != "OK") return explicitlyReturned
 
-    val implicitlyReturned = run1 @f{(): String ->
+    val implicitlyReturned = run1 @f{
         if (a < 0)
           return@f "Fail 2"
         else "OK"

compiler/testData/codegen/box/closures/localReturnWithAutolabel.kt

@@ -1,13 +1,13 @@
 fun box(): String {
     val a = 1
-    val explicitlyReturned = run1 {(): String ->
+    val explicitlyReturned = run1 {
         if (a > 0)
           return@run1 "OK"
         else "Fail 1"
     }
     if (explicitlyReturned != "OK") return explicitlyReturned
 
-    val implicitlyReturned = run1 {(): String ->
+    val implicitlyReturned = run1 {
         if (a < 0)
           return@run1 "Fail 2"
         else "OK"