Analyse: custom area draw edit button issues

[tmfrnz]

Shape edit button appears when

• draw function is enabled after an area has already been defined (eg reloading, switching to "predefined" and back)
• the user finishes drawing a second feature (or more)

Editing shapes works in principal however the "Save" button does not work as it effectively deletes the shapes.

While it would be nice to have I suggest to disable the edit function for now