DeliveryAdminWindow: Fix creation of new deliveries

Elwig/Windows/ContextWindow.cs

@@ -30,11 +30,19 @@ namespace Elwig.Windows {
         }
 
         public async void ForceContextReload(object sender, EventArgs evt) {
-            await HintContextChange();
+            await ForceContextReload();
         }
 
-        public async Task HintContextChange() {
+        public async Task ForceContextReload() {
+            HintContextChange();
+            await TryContextReload();
+        }
+
+        public void HintContextChange() {
             _renewPending = true;
+        }
+
+        public async Task TryContextReload() {
             if (LockContext) return;
             await EnsureContextRenewed();
         }