fix of "widget_link" parameter name in StoryShareParams

tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/stories/StoryShareParams.kt

@@ -12,6 +12,6 @@ fun StoryShareParams(
 ): StoryShareParams {
     val result: dynamic = js("{}")
     result["text"] = text
-    widgetLink ?.let { result["widgetLink"] = it }
+    widgetLink ?.let { result["widget_link"] = it }
     return result.unsafeCast<StoryShareParams>()
 }