Unable to import monomer with asterisk in BILN alias from BILN

Found while testing [#9456](https://github.com/epam/ketcher/issues/9456)

**Steps to Reproduce:**

1. Open Macromolecules - Flex mode (clean canvas)
2. Click `Open` button - Past from clipboard option
3. Paste `Test*` and select BILN in the dropdown
4. Click `Open as New` button

**Actual Result:**
A convert error appears, unable to import the monomer from BILN

**Expected Result:**
No error appears, the monomer with an asterisk in the BILN alias can be imported from BILN
As per reqs:

**Additional Info:** Export of a monomer containing an asterisk in the BILN alias to BILN format works fine

**Found in Environment:**
- Ketcher Version 3.17.0-rc.1 Build at 2026-06-02; 21:27:10
- Indigo Version 1.45.0-rc.2.0-g168fb85f2-wasm32-wasm-clang-23.0.0
- Chrome Version 149.0.7827.103 (Official Build) (64-bit)
- Win11