Disable default stdout/stderr

Some devices (mostly Xiaomi) print internal errors using
e.printStackTrace(), flooding the console with irrelevant errors.

Disable system streams used via System.out and System.err streams, to
print only the logs from scrcpy.

Refs #994 <https://github.com/Genymobile/scrcpy/issues/994>
Refs #4213 <https://github.com/Genymobile/scrcpy/pull/4213>