fix: use Icons.Setting (singular) - folds v2.6.2 has no Icons.Settings

Icons.Settings is undefined in folds v2.6.2; only Icons.Setting exists.
This caused TypeError: i is not a function when rendering m.room.join_rules
or m.room.guest_access state events in the room timeline, crashing DMs with
those events visible in the initial view.

src/app/features/room/RoomTimeline.tsx

@@ -1694,7 +1694,7 @@ export function RoomTimeline({ room, eventId, roomInputRef, editor }: RoomTimeli
             <EventContent
               messageLayout={messageLayout}
               time={timeJSX}
-              iconSrc={Icons.Settings}
+              iconSrc={Icons.Setting}
               content={
                 <Box grow="Yes" direction="Column">
                   <Text size="T300" priority="300">
@@ -1736,7 +1736,7 @@ export function RoomTimeline({ room, eventId, roomInputRef, editor }: RoomTimeli
             <EventContent
               messageLayout={messageLayout}
               time={timeJSX}
-              iconSrc={Icons.Settings}
+              iconSrc={Icons.Setting}
               content={
                 <Box grow="Yes" direction="Column">
                   <Text size="T300" priority="300">