Fix rpi-imager values as suggested at raspberrypi/rpi-imager#389

Author: guysoft

src/config

@@ -12,7 +12,7 @@ export BASE_IMAGE_ENLARGEROOT=2000
 export BASE_IMAGE_RESIZEROOT=200
 
 export RPI_IMAGER_NAME="UbuntuDockerPi version ${DIST_VERSION}"
-export RPI_IMAGER_DESCRIPTION="Ready to use 64bit ARM Docker for Raspberry Pi running on Ubuntu"
+export RPI_IMAGER_DESCRIPTION="Ready to use 64bit ARM Docker for Raspberry Pi based on Ubuntu"
 export RPI_IMAGER_ICON="https://raw.githubusercontent.com/guysoft/CustomPiOS/devel/media/rpi-imager-CustomPiOS.png"