fix searching for an arcade by serial

core/templates/sys/index.jinja

@@ -39,7 +39,7 @@
             OR
             <div class="form-group">
                 <label for="serialNum">Serial Number</label>
-                <input type="text" class="form-control" id="serialNum" name="serialNum" maxlength="12">
+                <input type="text" class="form-control" id="serialNum" name="serialNum" maxlength="15">
             </div>
             <br />
             <button type="submit" class="btn btn-primary">Search</button>