nuttx-configs increase idle thread stack size to 750 bytes

platforms/nuttx/nuttx-configs/aerocore2/nsh/defconfig

platforms/nuttx/nuttx-configs/aerofc-v1/nsh/defconfig

platforms/nuttx/nuttx-configs/auav-x21/nsh/defconfig

platforms/nuttx/nuttx-configs/av-x-v1/nsh/defconfig

platforms/nuttx/nuttx-configs/crazyflie/nsh/defconfig

platforms/nuttx/nuttx-configs/mindpx-v2/nsh/defconfig

platforms/nuttx/nuttx-configs/nxphlite-v3/nsh/defconfig

platforms/nuttx/nuttx-configs/omnibus-f4sd/nsh/defconfig

...s/nuttx/nuttx-configs/px4-same70xplained-v1/nsh/defconfig

...ms/nuttx/nuttx-configs/px4-stm32f4discovery/nsh/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v2/nsh/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v2/stackcheck/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v4/nsh/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v4/stackcheck/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v4pro/nsh/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v5/nsh/defconfig

platforms/nuttx/nuttx-configs/px4fmu-v5/stackcheck/defconfig

...orms/nuttx/nuttx-configs/px4nucleoF767ZI-v1/nsh/defconfig

platforms/nuttx/nuttx-configs/tap-v1/nsh/defconfig