ssb: Fix trying to connect to the same stored connection over and over.

apps/ssb/tf-tab-connections.js

@@ -142,12 +142,15 @@ class TfTabConnectionsElement extends LitElement {
 			}, {})
 		);
 		return html`
-			<button
-				class="w3-button w3-theme-d1"
-				@click=${() => tfrpc.rpc.closeConnection(connection.id)}
-			>
-				Close
-			</button>
+			${connection.connected ? html`
+				<button
+					class="w3-button w3-theme-d1"
+					@click=${() => tfrpc.rpc.closeConnection(connection.id)}
+				>
+					Close
+				</button>
+				`
+				: undefined}
 			${connection.flags.one_shot ? '🔃' : undefined}
 			<tf-user id=${connection.id} .users=${this.users}></tf-user>
 			${connection.tunnel !== undefined