use greater-equals for SonarQube tech_debt colors
use greater-equals for SonarQube tech_debt colors

Projects that have '0' technical debt would otherwise receive a
lightgrey badge instead of a brightgreen one.

Signed-off-by: Sebastian Hoß <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@shoss.de>

badges/shields,freezy-sk/shields,freezy-sk/shields,badges/shields,badges/shields