Update properties in JavaTalks migration

+----------------------------------------+-------+-----------------------------------------------------------------------------------------+
| NAME                                   | VALUE | VALIDATION_RULE                                                                         |
+----------------------------------------+-------+-----------------------------------------------------------------------------------------+
| jcommune.session_timeout               | 24    | /([0-9]|1[0-9]|2[0-4])/                                                                 |
| jcommune.sending_notifications_enabled | true  | /(true)|(false)/                                                                        |
| jcommune.avatar_max_size               | 51200 | /([0-9]{1,6}|10([0-3][0-9]{4}|4([0-7][0-9]{3}|8([0-4][0-9]{2}|5([0-6][0-9]|7[0-6])))))/ |
| jcommune.url_address                   |       | /((https?:\/\/)?(([\w][-\w_\.]*\.[a-z]{1,5})|(localhost)|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?(\/[-\w_\s()?=&#\.]+)*\/?)/ |