preview: add scroll to profile pic demo

Signed-off-by: William Casarin <jb55@jb55.com>

src/ui/profile/picture.rs

@@ -174,6 +174,7 @@ mod preview {
 
     impl View for ProfilePicPreview {
         fn ui(&mut self, ui: &mut egui::Ui) {
+            egui::ScrollArea::both().show(ui, |ui| {
                 ui.horizontal_wrapped(|ui| {
                     let txn = Transaction::new(&self.ndb).unwrap();
                     for key in &self.keys {
@@ -203,6 +204,7 @@ mod preview {
                             });
                     }
                 });
+            });
         }
     }