Set branding "Apply Application Logo" value to "no" by default

When configuring a branding using no UI or Web UI only (no JSF), apply application logo value is set to yes although the app logo can't be defined.

Setting it to "no" and updating the help would make it clearer.

TODO

• Set branding "Apply Application Logo" value to "no" by default for new and existing brandings when JSF UI is not available
  => for existing config people may see a popup about saving changes when accessing the config even if they didn't explicitly change the value

• When JSF UI is used, default value remains to "yes"

• Update contextual help for "apply application logo" to:

When using JSF UI, an application logo can be defined in the "Main Pages" tab and used in the login page as well. If you are using no UI or Web UI, this value is kept to no in order to select your own logo.

If you don't want to display a logo, just set height and with to 0px.