Password should not be revealed

[cmendible]

After checking the changes made in #98 I noticed that there is still a reveal button (eye) that users can click to display the password, something that tools such as Power BI Desktop do not allow.

A simple change of style would fix this.

Style="{StaticResource MahApps.Styles.PasswordBox.Button.Revealed}"

to

Style="{StaticResource MahApps.Styles.PasswordBox}"