refactor: remove artplayer-tool-iframe plugin entry from README

Author: zhw2590582

README.md

@@ -103,7 +103,6 @@ let art = new Artplayer({
 | Name | Describe | State |
 | :--- | :--- | :--- |
 | [artplayer-plugin-danmuku](https://artplayer.org/?libs=./uncompiled/artplayer-plugin-danmuku/index.js&example=danmuku) | Danmuku (bullet comment) system | <img src="https://img.shields.io/npm/v/artplayer-plugin-danmuku.svg?sanitize=true"><br><img src="https://img.shields.io/npm/dm/artplayer-plugin-danmuku.svg?sanitize=true"> |
-| [artplayer-tool-iframe](https://artplayer.org/?libs=./uncompiled/artplayer-tool-iframe/index.js&example=iframe) | Control player via iframe | <img src="https://img.shields.io/npm/v/artplayer-tool-iframe.svg?sanitize=true"><br><img src="https://img.shields.io/npm/dm/artplayer-tool-iframe.svg?sanitize=true"> |
 | [artplayer-plugin-hls-control](https://artplayer.org/?libs=https://cdnjs.cloudflare.com/ajax/libs/hls.js/1.5.17/hls.min.js%0A./uncompiled/artplayer-plugin-hls-control/index.js&example=hls.control) | HLS quality control | <img src="https://img.shields.io/npm/v/artplayer-plugin-hls-control.svg?sanitize=true"><br><img src="https://img.shields.io/npm/dm/artplayer-plugin-hls-control.svg?sanitize=true"> |
 | [artplayer-plugin-dash-control](https://artplayer.org/?libs=https://cdnjs.cloudflare.com/ajax/libs/dashjs/4.5.2/dash.all.min.js%0A./uncompiled/artplayer-plugin-dash-control/index.js&example=dash.control) | DASH quality control | <img src="https://img.shields.io/npm/v/artplayer-plugin-dash-control.svg?sanitize=true"><br><img src="https://img.shields.io/npm/dm/artplayer-plugin-dash-control.svg?sanitize=true"> |
 | [artplayer-plugin-vtt-thumbnail](https://artplayer.org/?libs=./uncompiled/artplayer-plugin-vtt-thumbnail/index.js&example=vtt.thumbnail) | VTT thumbnail preview | <img src="https://img.shields.io/npm/v/artplayer-plugin-vtt-thumbnail.svg?sanitize=true"><br><img src="https://img.shields.io/npm/dm/artplayer-plugin-vtt-thumbnail.svg?sanitize=true"> |