Adjust snackbar position when keyboard is shown

[grzesiek2010]

Closes #7184

Why is this the best possible solution? Were any other approaches considered?

The solution is consistent with how we handle bottom bars. There is nothing more to discuss.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

This should only affect how snackbars are displayed, so we can focus on this aspect. Nothing else should be affected.

Do we need any specific form for testing your changes? If so, please attach one.

The form is linked in the issue.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• added or modified tests for any new or changed behavior
• run ./gradlew connectedAndroidTest (or ./gradlew testLab) and confirmed all checks still pass
• added a comment above any new strings describing it for translators
• added any new strings with date formatting to DateFormatsTest
• verified that any code or assets from external sources are properly credited in comments and/or in the about file.
• verified that any new UI elements use theme colors. UI Components Style guidelines