lxqt.bbclass: various updates
lxqt.bbclass: various updates

* remove qt5-translation from inherit - we have lxqt-l10n only
* add lxqt-l10n to RDEPENDS
* remove unneeded comment

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@googlemail.com>

schnitzeltony/meta-qt5-extra,schnitzeltony/meta-qt5-extra,schnitzeltony/meta-qt5-extra