[NI] Fix checks for infix/operator conventions

compiler/testData/diagnostics/tests/modifiers/operatorInfix/Simple.kt

@@ -1,4 +1,3 @@
-// !WITH_NEW_INFERENCE
 // !DIAGNOSTICS: -UNUSED_PARAMETER, -EXTENSION_SHADOWED_BY_MEMBER
 
 open class Example {
@@ -29,14 +28,14 @@ fun test() {
     var a = Example()
     val b = Example()
 
-    consumeString(<!NI;TYPE_MISMATCH!><!NI;OPERATOR_MODIFIER_REQUIRED!>a<!>()<!>)
-    consumeString(<!NI;OPERATOR_MODIFIER_REQUIRED, NI;TYPE_MISMATCH!>a[1]<!>)
+    consumeString(a())
+    consumeString(a[1])
 
-    val (<!NI;OPERATOR_MODIFIER_REQUIRED!>x<!>, <!NI;OPERATOR_MODIFIER_REQUIRED!>y<!>) = Example()
-    consumeString(<!NI;TYPE_MISMATCH!>x<!>)
-    consumeString(<!NI;TYPE_MISMATCH!>y<!>)
+    val (x, y) = Example()
+    consumeString(x)
+    consumeString(y)
 
-    consumeExample2(<!NI;TYPE_MISMATCH!><!NI;OPERATOR_MODIFIER_REQUIRED!>++<!>a<!>)
+    consumeExample2(++a)
 
     consumeString(a plus b)
 }