Delete tree width records when field is set multiple times

There is no unique constraint so the method to set width should not rely on the
unicity of the field per screen size.

Closes #13997

trytond/trytond/ir/ui/view.py

@@ -548,11 +548,14 @@ class ViewTreeWidth(
                 ])
 
         fields = fields.copy()
-        to_save = []
+        to_save, to_delete = [], []
         for tree_width in records:
             if tree_width.screen_width == screen_width:
-                tree_width.width = fields.pop(tree_width.field)
-                to_save.append(tree_width)
+                if tree_width.field in fields:
+                    tree_width.width = fields.pop(tree_width.field)
+                    to_save.append(tree_width)
+                else:
+                    to_delete.append(tree_width)
 
         for name, width in fields.items():
             to_save.append(cls(
@@ -564,6 +567,8 @@ class ViewTreeWidth(
 
         if to_save:
             cls.save(to_save)
+        if to_delete:
+            cls.delete(to_delete)
 
     @classmethod
     def reset_width(cls, model, width):