Combinational Verilog component UI has missing confirmation on cancel dialog

[tomcl]

Describe the bug
Combinational Verilog components which are edited can be cancelled without saving. This loses all the edits - there should be a confirmation dialog in this case.

To Reproduce
Steps to reproduce the behavior:

1. Open an Issie sheet
2. In Catalog, click on create Verilog component
3. Change anything - keeping the component valid
4. Save button is highlighted, as is cancel button. Click cancel and all changes are lost

Expected behavior
In the case of unsaved changes I expect cancel to lead to a confirmation dialog saying there are unsaved changes.

Additional context
ISSIE is meant to be as user-friendly as possible - that means all irrecoverable operations should have conformation dialogs.