`Cmd` + `Shift` + `Y` shortcut stops working in Search mode

### Expected
During search, if it's possible to manually move focus to tags input and enter a new tag, it should be possible to jump to tags editing via `Cmd` + `Shift` + `Y` shortcut too.

### Observed
If the note is in search mode, `Cmd` + `Shift` + `Y` shortcut does not jump to tag editor from note editor (but jumps the other way around):

https://user-images.githubusercontent.com/73365754/115454866-ed170600-a229-11eb-8045-30e7ae665c3c.mov

### Reproduced
1. Have a note with some text
2. Enter any text into a search bar, that is also present in the mentioned note
3. Select a note and start editing it ~> it's possible
4. Hit `Cmd` + `Shift` + `Y` ~> focus does not jump to tag input

### Where did you see the bug
- System Make: Parallels Desktop on MBP 16”
- OS: Windows 10 Home 20H2
- Simplenote app version: 2.10.0-beta1

Reproduce the search-mode flow described in the issue: select a matching note, enter editing, and press Cmd + Shift + Y. Trace the shortcut handling for note editing, search mode, and the tag input; done means the shortcut focuses tag editing in search mode while the existing reverse direction still works.

Written by the indexing model from the issue text.