evil-undo (`u`) unaligns the cursors

evil-undo (u) unaligns the cursors, undo (C-/) keeps them aligned.

Reproduction steps

With multiple words in a buffer.

abcdef
abcdef
abcdef

In evil normal state, create evil-mc cursors on all occurrences by pressing: grm The cursors appear at the end of the words.
```
abcde[f]
abcde[f]
abcde[f]
```
Move back the cursors to the left twice: hh
```
abc[d]ef
abc[d]ef
abc[d]ef
```
Enter evil insert state: i
```
abc|def
abc|def
abc|def
```
Type a character: x
```
abcx|def
abcx|def
abcx|def
```
Exit to evil normal state: esc
```
abc[x]def
abc[x]def
abc[x]def
```
Move the cursors to the beginning of the words: b
```
[a]bxcdef
[a]bxcdef
[a]bxcdef
```
Undo: u (evil-undo)

Observed

The real cursor moved to the position where the x was. The fake cursors remain at the beginning of the words.

abc[d]ef
[a]bcdef
[a]bcdef

Expected

The cursors should remain aligned. This behavior is observed when the Emacs undo command is used: C-/ (undo) All cursors move to the positions where the x's were.

abc[d]ef
abc[d]ef
abc[d]ef

The cursors should probably stay where they were when the undo command was called.

[a]bcdef
[a]bcdef
[a]bcdef

Notes

The same behavior is also observed when the words are unaligned.

evil-undo (u)
```
abc[d]ef
[a]bcdef
[a]bcdef
```
undo (C-/)
```
abc[d]ef
abc[d]ef
abc[d]ef
```

System Info

evil-mc-20210730.1752 GNU Emacs 27.2 (build 1, x86_64-w64-mingw32) of 2021-03-26 Windows 21H1

gabesoft / evil-mc