Adjust testData: get rid of obsolete annotations

compiler/testData/codegen/boxWithStdlib/annotations/annotatedEnumEntry.kt

@@ -9,12 +9,12 @@ Retention(RetentionPolicy.RUNTIME)
 annotation class Second(val value: String)
 
 enum class E {
-    [First]
+    @First
     E1 {
         fun foo() = "something"
     }
 
-    [Second("OK")]
+    @Second("OK")
     E2
 }
 

compiler/testData/codegen/boxWithStdlib/annotations/annotatedLambda/lambda.kt

@@ -23,7 +23,7 @@ fun testClass(clazz: Class<*>, name: String) {
 }
 
 fun box(): String {
-    testClass(foo0([Ann("OK")] { }), "1")
+    testClass(foo0(@Ann("OK") { }), "1")
     testClass(foo0( @Ann("OK") { }), "2")
 
     testClass(foo0() @Ann("OK") { }, "3")

compiler/testData/codegen/boxWithStdlib/annotations/delegatedPropertySetter.kt

@@ -5,7 +5,7 @@ annotation class First
 
 class MyClass() {
     public var x: String by Delegate()
-        [First] set
+        @First set
 }
 
 class Delegate {