Ensure guest_num and duration have minimum values (#1001)

Co-authored-by: Sam Poyigi <6567634+sampoyigi@users.noreply.github.com>

app/admin/requests/Reservation.php

@@ -30,7 +30,8 @@ public function rules()
             'telephone' => ['sometimes'],
             'reserve_date' => ['required', 'valid_date'],
             'reserve_time' => ['required', 'valid_time'],
-            'guest_num' => ['required', 'integer'],
+            'guest_num' => ['required', 'integer', 'min:1'],
+            'duration' => ['integer', 'min:1'],
         ];
     }
 }