options: commandline: don't set bogus playtree option params

The command line parsing code recorded the next commandline argument,
if any, as the parameter of any option recorded to playtree. Thus a
command line like "mplayer file -fs -aid 1" would record option "-fs"
with a bogus argument "-aid". Historically this triggered no visible
problems because such bogus arguments were silently ignored when
interpreting the options later. However after recent commit 507fa7e2c2
("options: indicate ambiguous option parameters explicitly")
parameters to flag options are no longer ignored, and the bogus values
now triggered parsing errors. Add a check to stop recording parameters
for old-style single-dash options if m_config_check_option() says the
option did not consume any arguments.

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