Don't remove the element with external tool from the WD scene after editing

Now, in case of any editing of an element with external tool:

• a warning message box appears after clicking "Finish" in the element configuration wizard,
• the element is removed from the WD scene, if the user approved the message box.

It happens because the element could be a part of a workflow. But, actually, the problem can happen only when the element has ports, connected to other workers - if you remove a connected port, then UGENE won't figure out what it needs to do with the connection, so a user should connect the port again.

However, when data on the following pages are edited, ports and connections are not changed:

• "General"
• "Parameters"
• "Command"
• "Element appearance"

So, all such elements on the WD scene can be updated.

Thus in terms of the issue:

1. Show the warning message box and remove the elements only when data on "Input data" and "Output data" pages are changed,
2. Update elements on the WD scene when data on the other pages of the wizard are edited.