Remove backend tests on old inference

Also remove any mentions of NewInference, and rename some tests.

compiler/testData/codegen/box/callableReference/adaptedReferences/localFunctionWithDefault.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType
-
 fun call0(f: (String) -> String, x: String): String = f(x)
 fun call1(f: (String, String) -> String, x: String, y: String): String = f(x, y)
 fun call2(f: (String, String, String) -> String, x: String, y: String, z: String): String = f(x, y, z)
@@ -27,4 +25,4 @@ fun box(): String {
     val r3 = call2(::bar, "8", "9", "10")
     if (r3 != "7829") return "FAIL3 $r3"
     return "OK"
-}
+}