Disallow rich text in the ssb compose box.

apps/ssb.json

@@ -1,5 +1,5 @@
 {
 	"type": "tildefriends-app",
 	"emoji": "🐌",
-	"previous": "&TqpkOAi38Oi6gW6guh95KIvWY2M/vjBE8NLLNHK+M00=.sha256"
+	"previous": "&2xK//SIpjFb0+uT5I7MSAGJ3d1FKuI/rlzhcCQd3NME=.sha256"
 }

apps/ssb/tf-compose.js

@@ -538,7 +538,7 @@ class TfComposeElement extends LitElement {
 							id="edit"
 							@input=${this.input}
 							@paste=${this.paste}
-							contenteditable
+							contenteditable="plaintext-only"
 							.innerText=${live(draft.text ?? '')}
 						></span>
 					</div>