Change vcard.server and vcard_search.server to varchar(150)

The purpose of this change is to make the SQL script compatible with MySQL 5.1.70. Without this change the **CREATE TABLE vcard_search** query fails as follows:

```
ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
```

This is because this table's primary key is composed of the columns **lusername** and **server**, resulting in a key that exceeds MySQL 5.1.70's length limitation. **varchar(150)** is the longest round number that I have tested succesfully.

The change is **vcard.server**'s type is to make it equal to **vcard_search.server**.