Exercise UCCI option 'newgame' also after 'isready' handshake

Exercise UCCI option 'newgame' also after 'isready' handshake

The patch that moved the sending of 'ucinewgame' to after the initial
'isready' handshake overlooked that this was actually the else-clause
of an if-statement that emitted 'option newgame' for UCCI. Now it is not
really clear when the latter should be emitted, as it seems to be ignored
even in Elephant Eye, but treating it as a variant of 'ucinewgame' seems
best. Accidentally the statement behind it did not suffer from being
in the else-clause, as it processed the UCI_Variant option, which does
not exist in UCCI anyway.