Show a dialog if the DB key can't be decrypted due to a keystore error.

.../org/briarproject/bramble/api/account/AccountManager.java

.../org/briarproject/bramble/api/crypto/CryptoComponent.java

.../briarproject/bramble/api/crypto/DecryptionException.java

...org/briarproject/bramble/api/crypto/DecryptionResult.java

.../org/briarproject/bramble/account/AccountManagerImpl.java

.../org/briarproject/bramble/crypto/CryptoComponentImpl.java

.../briarproject/bramble/account/AccountManagerImplTest.java

...arproject/bramble/crypto/PasswordBasedEncryptionTest.java

...c/main/java/org/briarproject/briar/android/AppModule.java

...g/briarproject/briar/android/activity/ActivityModule.java

...arproject/briar/android/login/ChangePasswordActivity.java

...rproject/briar/android/login/ChangePasswordViewModel.java

...ava/org/briarproject/briar/android/login/LoginModule.java

...java/org/briarproject/briar/android/login/LoginUtils.java

...rg/briarproject/briar/android/login/PasswordFragment.java

...rg/briarproject/briar/android/login/StartupViewModel.java

...ain/java/org/briarproject/briar/android/util/UiUtils.java

...briarproject/briar/android/viewmodel/ViewModelModule.java

briar-android/src/main/res/values/strings.xml

...oject/briar/android/login/ChangePasswordActivityTest.java