docs: drop the Accounts half of a stale label comment

The Accounts page (and its list labels) retired at 4392b57; the comment
kept naming them.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 7629b7d..d52a1ce 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1883,7 +1883,7 @@ impl ClearEmailApp {
         // Widget text rides along with chrome in display_list's paint_root_into
         // walk — only app-composed labels are emitted here.
 
-        // 3. Email List Labels / Accounts list labels.
+        // 3. Email List Labels.
         // Skipped while a modal is up: text always renders above geometry, and these
         // hand-emitted labels carry no bounds, so they'd bleed straight through the
         // modal panel (the popover-occlusion clamp only knows registered popovers).