Fix media upgrade dialog configuration

[EgorovEI]

MOB-3768

What was solved?
After adding AlertManager class configuring alert dialogs was broken. As a result for Audio, 1-way Video, 2-way Video offers the SDK always showed 2-way Video media upgrade dialog. That was only UI configuration issue, accepting the offer resulted in establishing right media type. This commit fixes alert configuration issue.

Acceptance tests will be added in separate task later.

Release notes:

• Feature
• Ignore
• Release notes (Is it clear from the description here?)
• Migration guide (If changes are needed for integrator already using the SDK - what needs to be communicated? Add underneath please)

Additional info:

• Is the feature sufficiently tested? All tests fixed? Necessary unit, acceptance, snapshots added? Check that at least new public classes & methods are covered with unit tests
• Did you add logging beneficial for troubleshooting of customer issues?
• Did you add new logging? We would like the logging between platforms to be similar. Refer to Logging from iOS SDKs → Things to consider for newly added logs in Confluence for more information.

[igorkravchenko]

Is it possible to unit test it? Basically to assert configuration?