Search input does not handle inputs properly

[frol]

1. Go to https://explorer.near.org
2. Type anything (e.g. "near")
3. Move cursor to the left (e.g. between "n" and "e")
4. Hit [DELETE] / [BACKSPACE] button or some other character
5. Observe that the cursor jumps to the end of the input, so it is not possible to add several characters in the middle of the string or remove 2+ characters from the middle of the string

[luixo]

WIll get closed on https://github.com/near/near-explorer/pull/1154 merge