if I set both the fallback and the codec to be used for saving I would not
expect Kate to automatically choose other encoding (there is already a
warning that data loss may occur if chosen encoding will not work). the
test is just bogus and there is no option to fallback to encoding that will
be able to save the data if the set encoding cannot encode the data - it is
explicitly chosen
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>