BIM: fix Arch_Schedule column width handling

Fixes #20723.

The clearAll method resets the column widths of the sheet. The code now stores the old widths and restores them after calling the method.

The old problem that the method would remove the custom property no longer occurs so that code was removed.

src/Mod/BIM/ArchSchedule.py

@@ -203,14 +203,16 @@ class _ArchSchedule:
         if not (obj.CreateSpreadsheet or force):
             return
         sp = self.getSpreadSheet(obj, force=True)
+        widths = [sp.getColumnWidth(col) for col in ("A", "B", "C")]
         sp.clearAll()
-        # clearAll removes the custom property, we need to re-add it:
-        self.setSchedulePropertySpreadsheet(sp, obj)
+        # clearAll resets the column widths:
+        for col, width in zip(("A", "B", "C"), widths):
+            sp.setColumnWidth(col, width)
         # set headers
-        sp.set("A1","Operation")
-        sp.set("B1","Value")
-        sp.set("C1","Unit")
-        sp.setStyle('A1:C1', 'bold', 'add')
+        sp.set("A1", "Operation")
+        sp.set("B1", "Value")
+        sp.set("C1", "Unit")
+        sp.setStyle("A1:C1", "bold", "add")
         # write contents
         for k,v in self.data.items():
             sp.set(k,v)