Fix compiler tests

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

@@ -1,7 +1,7 @@
 interface Foo<T>
 
 class Bar {
-    fun <T> invoke(): Foo<T> = throw Exception()
+    operator fun <T> invoke(): Foo<T> = throw Exception()
 }
 
 class A {

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

@@ -15,7 +15,7 @@ public final class Bar {
     public constructor Bar()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public final fun </*0*/ T> invoke(): Foo<T>
+    public final operator fun </*0*/ T> invoke(): Foo<T>
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }