Fix tests: "infix modifier required" and "operator modifier required" errors

compiler/testData/codegen/box/innerNested/innerInfixCall.kt

@@ -1,15 +0,0 @@
-class Z() {
-
-    inner class Z2(val s: String) {
-
-    }
-
-    fun a(): String {
-        val s = Z() Z2 "OK"
-        return s.s
-    }
-}
-
-fun box(): String {
-     return Z().a()
-}