ssb: Place the message collapse better with the messages it collapses.

apps/ssb.json

@@ -1,5 +1,5 @@
 {
 	"type": "tildefriends-app",
 	"emoji": "🦀",
-	"previous": "&ULwb8udTxSkqf+mcZ0NxJs6p/hGB03eQEEKzJvWO3fk=.sha256"
+	"previous": "&CvV0TK1E0a2bOQSvieNbxsJg0JHeuDNWBsL+vEJLoKs=.sha256"
 }

apps/ssb/tf-message.js

@@ -383,14 +383,16 @@ class TfMessageElement extends LitElement {
 								></tf-message>
 							</li>`
 					)}
-					</ul>
+					<li style="padding: 0" class="w3-margin-bottom">
 						<button
 							class="w3-button w3-theme-d1 w3-block w3-bar"
 							style="box-sizing: border-box"
 							@click=${() => self.set_expanded(false)}
 						>
 							Collapse
-					</button>`;
+						</button>
+					</li>
+				</ul>`;
 			}
 		} else {
 			return undefined;