small fix while choosing maximally specific

return success if there is one candidate after filterOverrides step
 #KT-1461 fixed

compiler/testData/diagnostics/tests/smartCasts/kt1461.kt

@@ -0,0 +1,18 @@
+//KT-1461 Front-end complains on overload resolution when superclass property is accessed from string template and implicit type cast is performed
+package f
+
+open class Super(val property : String) {}
+
+class Sub(str : String) : Super(str) {}
+
+fun foo(sup : Super, sub : Sub) {
+    if (sup is Sub) {
+        println("${sup.property}")
+        println(sup.property)
+    }
+    println("${sub.property}")
+    println(sub.property)
+}
+
+//from library
+fun println(<!UNUSED_PARAMETER!>message<!> : Any?) { throw Exception() }