fix: remove edge-case wrapping_add

left this on accident when I decided wrapping around isn't useful
(especially without it scrolling to show the selection)

src/app/mod.rs

@@ -127,12 +127,8 @@ impl State {
             }
             Message::SelectionLeft => self.selected_field.previous(),
             Message::SelectionDown => {
-                self.selected_entry = if self.selected_entry == self.db_view.len() - 1 {
-                    // essentially do a wrapping_add up to the highest index in the view
-                    0
-                } else {
+                self.selected_entry =
                     (self.selected_entry.saturating_add(1)).clamp(0, self.db_view.len() - 1)
-                }
             }
             Message::SelectionUp => {
                 self.selected_entry =