compiler testdata: s/trait/interface

compiler/testData/diagnostics/tests/resolve/nestedCalls/argumentsInParentheses.kt

@@ -1,4 +1,4 @@
-trait Foo<T>
+interface Foo<T>
 
 class Bar {
     fun <T> invoke(): Foo<T> = throw Exception()

compiler/testData/diagnostics/tests/resolve/nestedCalls/kt7597.kt

@@ -1,6 +1,6 @@
 // !CHECK_TYPE
 
-trait Inv<I>
+interface Inv<I>
 
 fun <S, T: S> Inv<T>.reduce2(): S = null!!