boards: arm: thingy53: Disable USB remote wakeup by default

For Thingy:53 board, USB remote wakeup should be disabled by
default. Current solution disabled it from Kconfig.defconfig,
but was always overwritten by imply in CONFIG_USB_NRFX.
This change disables it in board *_defconfig files.

Signed-off-by: Mateusz Kapala <mateusz.kapala@nordicsemi.no>