Revert "Extend teleTAN to 10 characters + input validation (#252)" (#267)

...rki/coronawarnapp/ui/submission/SubmissionTanViewModel.kt

...n/java/de/rki/coronawarnapp/ui/submission/TanConstants.kt

.../main/java/de/rki/coronawarnapp/ui/submission/TanInput.kt

...-App/src/main/java/de/rki/coronawarnapp/util/TanHelper.kt

...coronawarnapp/util/formatter/FormatterSubmissionHelper.kt

Corona-Warn-App/src/main/res/drawable/tan_input_digit.xml

...arn-App/src/main/res/drawable/tan_input_digit_entered.xml

...-Warn-App/src/main/res/drawable/tan_input_digit_error.xml

...-Warn-App/src/main/res/layout/fragment_submission_tan.xml

Corona-Warn-App/src/main/res/layout/view_tan_input.xml

Corona-Warn-App/src/main/res/values/dimens.xml

Corona-Warn-App/src/main/res/values/strings.xml

Corona-Warn-App/src/main/res/values/styles.xml

...coronawarnapp/ui/submission/SubmissionTanViewModelTest.kt

.../src/test/java/de/rki/coronawarnapp/util/TanHelperTest.kt