Site manager dialog closes on escape key even when editing an item / doesn't save changes

[Matthew]

1. Closing Site Manager with unsaved changes should cause confirmation prompt

Steps to reproduce:

1. Open FileZilla Client 3.3.5.1
2. Open Site Manager (Ctrl+S)
3. Create a new directory, move a few connection profiles in there
4. Push escape or press Cancel

Actual behaviour:

Site Manager cloes without saving changes, and without warning.

Expected behavoiur:

Site Manager should check whether changes have been made, and prompt the user if changes are to be saved or discarded

2. Pressing escape key whilst editing a Site Manager folder or connection profile causes the dialog to close

Steps to reproduce:

1. Open FileZilla Client 3.3.5.1
2. Open Site Manager (Ctrl+S)
3. Create a new directory, and while the edit box for the folder name is still editable, press escape

Actual behaviour:

Site Manager cloes without saving changes, and without warning.

Expected behavoiur:

Site Manager should cancel the edit opertion on the folder or connection profile and keep Site Manager open.

[larsen255]

This also happens when you use the mouse to move an entry into another folder, decide to not do it, and press Esc.