compiler testdata: s/trait/interface

compiler/testData/codegen/box/delegatedProperty/inTrait.kt

@@ -2,7 +2,7 @@ class Delegate {
     fun get(t: Any?, p: PropertyMetadata): Int = 1
 }
 
-trait A {
+interface A {
     val prop: Int
 }
 

compiler/testData/codegen/box/delegatedProperty/kt4138.kt

@@ -11,7 +11,7 @@ class Foo (val f: Int) {
     }
 }
 
-trait FooTrait {
+interface FooTrait {
     companion object {
         val A: Foo by Delegate(Foo(11))
         var B: Foo by Delegate(Foo(11))

compiler/testData/codegen/box/delegatedProperty/propertyDelegatedMethod/inTrait.kt

@@ -4,7 +4,7 @@ class Delegate {
     fun propertyDelegated(p: PropertyMetadata) { name = p.name }
 }
 
-trait A {
+interface A {
     val prop: String
 }