Rename/Alias wrong in some scenarios

[SuperMMX]

1. Select a collapsed group.
2. Right click, click rename, or press F2 directly, so we are in editing.
3. Press ESP to cancel editing.
4. Press Enter/Space, or click it directly.
5. So here, the group name with online/all buddy count will appear in the edit entry. (But only the group name is supposed to be there)

And, this affects the buddy with status infomation too.

Here is the patch, set the correct text in the edit entry when start editing.

[lschiere]

Sean, I believe you wrote this code.

[lschiere]

Fixes #95

[MarkDoliner]

This looked ok to me. Thanks