fix backend tests

src/model/tripdetails.rs

@@ -94,7 +94,7 @@ WHERE day = ? AND planned_starting_time = ?
         .await.unwrap()
     }
 
-    pub fn cancelled(&self, db: &SqlitePool) -> bool {
+    pub fn cancelled(&self) -> bool {
         self.max_people == 0
     }
 
@@ -106,7 +106,7 @@ WHERE day = ? AND planned_starting_time = ?
             return;
         }
 
-        if self.cancelled(db) {
+        if self.cancelled() {
             // Cox cancelled event, thus it's probably bad weather. Don't bother with sending
             // notifications
             return;