AccountFragment: Throw users on splashFragment on logout

We have multiple checks implemented at this point in splashFragment to ensure
proper validation and navigation. If a user logs out and hits back button, he still
gets to browse Aurora Store which is an unintended behaviour.

Instead of handling same logic twice everywhere, make AccountFragment minimal and only
handle logging out here.

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/res/values-el/strings.xml

@@ -37,7 +37,6 @@
     <string name="action_back">Επιστροφή</string>
     <string name="account_logout">Αποσύνδεση από το Aurora</string>
     <string name="account_login_using">Σύνδεση με</string>
-    <string name="account_logged_out">Έχετε αποσυνδεθεί</string>
     <string name="account_google">Google</string>
     <string name="account_anonymous">Ανώνυμος</string>
     <string name="about_telegram_summary">Γίνετε μέλος της ομάδας Υποστήριξης Aurora για συζητήσεις ή προτάσεις.</string>