tox.ini (ubuntu-lunar,mantic): Remove IGNORE_MISSING_SYSTEM_PACKAGES; all standard packages are available

Author: Matthias Koeppe

tox.ini

@@ -222,9 +222,7 @@ setenv =
     ubuntu-focal:     BASE_TAG=focal
     ubuntu-jammy:     BASE_TAG=jammy
     ubuntu-lunar:     BASE_TAG=lunar
-    ubuntu-lunar:                              IGNORE_MISSING_SYSTEM_PACKAGES=yes
     ubuntu-mantic:    BASE_TAG=mantic
-    ubuntu-mantic:                             IGNORE_MISSING_SYSTEM_PACKAGES=yes
     #
     # https://hub.docker.com/_/debian
     # debian-buster does not have libfreetype-dev (it only has libfreetype6-dev)