fixes issue where the checklist is marked as (passed) when only a single group has passed

src/FlightDisplay/PreFlightCheckList.qml

@@ -42,9 +42,14 @@ Rectangle {
                 group = checkListRepeater.itemAt(index + 1)
                 group.enabled = true
                 group._checked = true
+            } else if ((index + 1) == checkListRepeater.count) {
+                // If the last group is passed, we mark the entire checklist as passed.
+                _passed = true
+                checklistDropPanel.close()
             }
+        } else {
+            _passed = false
         }
-        _passed = passed
     }
 
     //-- Pick a checklist model that matches the current airframe type (if any)