Fix for searching gmail boxed with utf 8 strings

For some reason gmail fails to parse search command containing utf-8 strings
It returns Could not parse command

But sending the string as a separate line does the magic - it searches successfully
The conversation looks like this:

```
4 SEARCH CHARSET UTF-8 SUBJECT {24}
+ go ahead with 24 octets
<UTF8 string >TEXT {26}
+ go ahead with 26 octets
<UTF8 string >
4 OK SEARCH completed (no messages)
```