ssb: Don't display mentions for tags that are used in the text of a message.

apps/ssb.json

@@ -1,5 +1,5 @@
 {
 	"type": "tildefriends-app",
 	"emoji": "🦀",
-	"previous": "&51G4JroQ8+3iBddnFQoTVXYrLTtZ/egQ+0NU4z60zBc=.sha256"
+	"previous": "&MT6BBjSYx78iHX7+KHJzCnHYGPOJB4Vng8Dw2ymDaS4=.sha256"
 }

apps/ssb/tf-message.js

@@ -253,7 +253,7 @@ class TfMessageElement extends LitElement {
 	render_mentions() {
 		let mentions = this.message?.content?.mentions || [];
 		mentions = mentions.filter(
-			(x) => this.message?.content?.text?.indexOf(x.link) === -1
+			(x) => this.message?.content?.text?.indexOf(typeof(x) === 'string' ? x : x.link) === -1
 		);
 		if (mentions.length) {
 			let self = this;