eca-chainsetup: Fix defaults for nonrt buffering mode
eca-chainsetup: Fix defaults for nonrt buffering mode

Fix a typo in 'nonrt' buffering mode default values.
Real-time priority and double-buffering paramteres were
incorrectly initialized to true.

This bug was introduced during 2.7.0 development.

jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2