BIM: Remove icon after unclone (#24654)

As the title says - upon unclone icon is not being removed, but the
cloned item stops mirroring original item which is correct, so this just
aligns the icon removal logic with the correct behavior.

src/Mod/BIM/bimcommands/BimUnclone.py

@@ -69,6 +69,8 @@ class BIM_Unclone:
                 else:
                     newobj = obj
                     newobj.CloneOf = None
+                    if hasattr(newobj, "ViewObject") and newobj.ViewObject:
+                        newobj.ViewObject.signalChangeIcon()
 
                 # copy properties over, except special ones
                 for prop in cloned.PropertiesList: