Backmerge: #1796 Some bonds from ChemDraw don't display correctly in the Ketcher.

[AliaksandrDziarkach]

Fix code to load tautomeric bond as single/double. Fix UT

Backmerge request

• [ ] PR name follows the pattern Backmerge: #1234 – issue name
• [ ] PR is linked with the issue
• [ ] base branch (master or release/xx) is correct
• [ ] code contains only backmerge changes