fix UI elements being used before initialization
commit 18bc7e43 introduced calls to setRevealPasswordAvailable() on password fields.
those calls happened before m_ui->password and m_ui->customPassword were initialized by the call to m_ui->setupUI(), and led to a crash when trying to open the settings of an IMAP account.
Fix that by moving the calls to setRevealPasswordAvailable() down after setupUi().