scripts: footprint: fix print alignment and color
scripts: footprint: fix print alignment and color

The size percentage was doing "xx.xx%" so 100% would not be
aligned correctly when printed. So add a space for percentage
printing.

Also change the coloring of "(hidden)" node so it would not
have the same color as files or symbols.

Signed-off-by: Daniel Leung <d94e04d205b5962d7873a139ef298b03c1717f72@intel.com>

zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr