JS: fix translation of calls with aliased labeled lambda arguments. Fix KT-14999

compiler/testData/codegen/box/operatorConventions/operatorSetLambda.kt

@@ -0,0 +1,16 @@
+// See KT-14999
+
+object Obj {
+    var key = ""
+    var value = ""
+
+    operator fun set(k: String, v: ((String) -> Unit) -> Unit) {
+        key += k
+        v { value += it }
+    }
+}
+
+fun box(): String {
+    Obj["O"] = label@{ it("K") }
+    return Obj.key + Obj.value
+}