Remove some async clipboard web-features tags

ClipboardEvent is part of the older API:
https://w3c.github.io/clipboard-apis/#clipboard-event-api

The "clipboard-read" permission was removed from the spec:
w3c/clipboard-apis#132

api/ClipboardEvent.json

@@ -4,9 +4,6 @@
  "__compat": {
  "mdn_url": "https://developer.mozilla.org/docs/Web/API/ClipboardEvent",
  "spec_url": "https://w3c.github.io/clipboard-apis/#clipboard-event-interfaces",
- "tags": [
- "web-features:async-clipboard"
- ],
  "support": {
  "chrome": {
  "version_added": "41"
@@ -43,9 +40,6 @@
  "description": "<code>ClipboardEvent()</code> constructor",
  "mdn_url": "https://developer.mozilla.org/docs/Web/API/ClipboardEvent/ClipboardEvent",
  "spec_url": "https://w3c.github.io/clipboard-apis/#dom-clipboardevent-clipboardevent",
- "tags": [
- "web-features:async-clipboard"
- ],
  "support": {
  "chrome": {
  "version_added": "58"
@@ -82,9 +76,6 @@
  "__compat": {
  "mdn_url": "https://developer.mozilla.org/docs/Web/API/ClipboardEvent/clipboardData",
  "spec_url": "https://w3c.github.io/clipboard-apis/#clipboardevent-clipboarddata",
- "tags": [
- "web-features:async-clipboard"
- ],
  "support": {
  "chrome": {
  "version_added": "41"

api/Permissions.json

@@ -257,9 +257,6 @@
  "permission_clipboard-read": {
  "__compat": {
  "description": "<code>clipboard-read</code> permission",
- "tags": [
- "web-features:async-clipboard"
- ],
  "support": {
  "chrome": {
  "version_added": "64"