TextEditorActionHandler: Remove virtual keywords

No class derives from this, so the virtuals are not needed.

Change-Id: I251abc32cef6f4aacf39f31af1106eeebd8fe31e
Reviewed-by: David Schulz <david.schulz@digia.com>
Qt Quick Wizards: Prefer mobile to desktop kits

This also affects the Html5Wizard. Compare to code in
BaseQt4ProjectWizardDialog::addTargetSetupPage

Note: The selected platform refers to the "filter" combobox in the top
right of the new project wizard.

Change-Id: I0d7d5162a2693ea0ced03f928fa7c4d67a4ac164
Reviewed-by: Kai Koehne <kai.koehne@digia.com>