fix: mention crashing on select after sending message

[trOnk12]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

• After users types @ and sends a message without selection item from the mention list, the app crashes next time user presses the item after the message is sent.

Solutions

• Clear the mention search result after sending a text message.

Dependencies (Optional)

If there are some other pull requests related to this one (e.g. new releases of frameworks), specify them here.

Needs releases with:

• GitHub link to other pull request

Testing

Test Coverage (Optional)

• I have added automated test to this contribution

How to Test

Briefly describe how this change was tested and if applicable the exact steps taken to verify that it works as expected.

Notes (Optional)

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[CLAassistant]

All committers have signed the CLA.

[ohassine]

You are going to update kalium with a reference that does not exist, I can't see 7722de in RC branch of kalium.
Could you please recheck, correct reference is 8561d8c

[github-actions]

Test Results

512 tests   511 ✔️  31s ⏱️
  74 suites      1 💤
  74 files        0 ❌

Results for commit eb038ba.

[github-actions]

APKs built during tests are available here. Scroll down to Artifacts!

[AndroidBob]

Build 879 succeeded.

The build produced the following APK's:

• com.wire.android-v4.3.0(7209564)(7209564)-staging-compat.apk