Make repo_missing return dependencies as aport names instead of subpackage names

Currently the repo_missing script prints the packages that the aport depends on that needs to be build:

    {
        "pkgname": "breeze-icons",
        "repo": "kde",
        "version": "5.54.0-r0",
        "depends": [
            "extra-cmake-modules",
            "qt5-qtbase-dev"
        ]
    },

the qt5-qtbase-dev is the package that causes issue, it's more useful to return the aport names instead since they are built as aports not as subpackages.