FinishedPage: add copyright, reduce warnings

src/modules/finished/FinishedPage.cpp

@@ -1,6 +1,7 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
  *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -107,6 +108,7 @@ FinishedPage::focusInEvent( QFocusEvent* e )
 void
 FinishedPage::onInstallationFailed( const QString& message, const QString& details )
 {
+    Q_UNUSED( message );
     ui->mainText->setText( tr( "<h1>Installation Failed</h1><br/>"
                              "%1 has not been installed on your computer.<br/>"
                              "The error message was: %2." )

src/modules/finished/FinishedPage.h

@@ -1,6 +1,7 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
  *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by

src/modules/finished/FinishedViewStep.cpp

@@ -1,6 +1,7 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
  *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by