bookings: shorten Sequoia cabin to Sep 24-26

Host approved the date-change request the same morning with no
cancellation fee. Total drops from US$771.16 to US$542.73; a US$228.43
refund is pending on the card. Update the itinerary, expense ledger and
settlement, mark Sep 26 as checkout day, and save the Booking.com chat
and modification confirmation as sources.

expenses.md

@@ -16,7 +16,7 @@ Tricount's default currency is USD. Shared expenses are split 50/50 between **KT
 
 | Category | Expense | Amount | Paid by | Allocation | Source |
 |---|---|---:|---|---|---|
-| Accommodation | Sequoia cabin | US$771.75 | LKMS | Shared 50/50 | [`cabin-sequoia-miramonte.md`](bookings/stays/cabin-sequoia-miramonte.md) |
+| Accommodation | Sequoia cabin | US$542.73 | LKMS | Shared 50/50 | [`cabin-sequoia-miramonte.md`](bookings/stays/cabin-sequoia-miramonte.md) |
 | Accommodation | Yosemite cabin | US$933.75 | LKMS | Shared 50/50 | [`cabin-yosemite-wawona.md`](bookings/stays/cabin-yosemite-wawona.md) |
 | Accommodation | SF Airbnb | US$755.01 | LKMS | Shared 50/50 | [`airbnb-sf-daly-city.md`](bookings/stays/airbnb-sf-daly-city.md) |
 | Accommodation | Los Angeles — DTLA Airbnb (4 nights) | US$1,209.63 | KTVT | Shared 50/50 | [`airbnb-la-dtla.md`](bookings/stays/airbnb-la-dtla.md) |
@@ -26,4 +26,4 @@ Tricount's default currency is USD. Shared expenses are split 50/50 between **KT
 
 ## Settlement
 
-**KTVT owes LKMS US$540.56.**
+**KTVT owes LKMS US$426.05.**