Fix AuthenticationDialogFragment soft input mode

[Radiokot]

Setting the correct mode fixes the keyboard not being shown when the auth dialog is opened.

Purpose

When using the wallet on a phone without biometric capabilities, you have to spend one click each time the auth dialog is shown to get the keyboard shown.

Changes

• Fix AuthenticationDialogFragment soft input mode

Checklist

• [x] My code follows the style of this project.
• [x] The code compiles without warnings.
• [x] I have performed a self-review of the changes.
• [x] I have documented my code, in particular the intent of the hard-to-understand areas.
• [x] (If necessary) I have updated the CHANGELOG.

CLA acceptance

_Remove if not applicable.

By submitting the contribution I accept the terms and conditions of the Contributor License Agreement v1.0

• link: https://developers.concordium.com/CLAs/Contributor-License-Agreement-v1.0.pdf

• [x] I accept the above linked CLA.

[TouHouNo]

big thanks for your contributions. unfortunatly I cant edit/modify your PR-s. In order not to bother you more i have collected your contributions in 1 PR and rebased it on the latest codebase :D https://github.com/Concordium/concordium-reference-wallet-android/pull/307

I'll close this PR