Undo undoes too much

[doskabouter]

Maputnik version:v1.7.0 Browser: Firefox latest OS:Windows

Description of the bug: If you change multiple things, ctrl-z undoes them all in one go

Steps to reproduce the behavior:

1. Open random mapstyle, select one of the items
2. Change something in the filter
3. Change a color
4. press ctrl-z

Expected result would be that at first press, the color is reverted, and on the second press the filter is reverted. Even selecting a different item inbetween step 2 and 3 (to hopefully trigger a savepoint) results in both actions being undone in one step