FireMotD: fix Used Memory null problem due to typo

OutsideIT / FireMotD

:fire: Fire Framework Linux MoTD Generator :fire:

https://outsideit.net/firemotd

GNU General Public License v3.0

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Closed DanielTimLee closed 5 years ago

DanielTimLee commented 5 years ago

Currently used memory is printed as nullGB

##    Memory = Free: 6.83GB (89%), Used: nullGB (11%), Total: 7.67GB

Fix jq filter typo at RenderMemory section from UsedG to UsedGB