Long filter name is cut off during editing

### Please answer the following questions for yourself before submitting an issue

- [X] Filters were updated before reproducing an issue
- [X] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [X] I checked to make sure that this issue has not already been filed

### AdGuard version

4.5.3

### Environment

- OS: 17.4
- Device: iPad mini

### Ad Blocking

_No response_

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

_No response_

### Language-specific

_No response_

### Advanced protection for Safari

- [ ] yes, I do

### Which DNS server do you use?

DNS protection disabled

### DNS protocol

DNS protection disabled

### Custom DNS

_No response_

### DNS filtering

- [ ] yes, I do

### Custom DNS filter

_No response_

### DNS implementation

DNS protection disabled

### Tunnel mode

DNS protection disabled

### Low-level settings

Bootstrap server:
Fallback server:
Blocking mode, etc:

### Issue Details

Steps to reproduce:
1. Make a filter with long name, for example "На другой день были у фельдмаршала обед и бал, которые государь удостоил своим присутствием"
2. Go to Safari protection -> Filters -> Custom
3. Tap on Add a filter
4. Type a link of your filter
5. Tap on Next
6. Place the cursor somewhere in the middle or end of the title
7. Tap on Backspace

### Expected Behavior

1 character is erased

### Actual Behavior

Some words are erased

### Screenshots

Screenshot 1

### Additional Information

_No response_