gui: upgrade liana dependency

gui/Cargo.lock

@@ -2624,7 +2624,7 @@ dependencies = [
 [[package]]
 name = "liana"
 version = "7.0.0"
-source = "git+https://github.com/wizardsardine/liana?branch=master#18950c219a9233e584fabb1f5b168e17fa450902"
+source = "git+https://github.com/wizardsardine/liana?branch=master#c2ce025a78891307e1f0d83c52cb983eb098d41d"
 dependencies = [
  "backtrace",
  "bdk_coin_select",

gui/src/lianalite/client/backend/mod.rs

@@ -584,6 +584,8 @@ impl Daemon for BackendWalletClient {
             sync: 1.0,
             rescan_progress: None,
             timestamp: wallet.created_at as u32,
+            // We can ignore this field for remote backend as the wallet should remain synced.
+            last_poll_timestamp: None,
         })
     }