base/bootloader: Drop /usr/lib/ostree-boot/loader

A quick workaround for https://issues.redhat.com/browse/RHEL-78104

tier-0/bootupd.yaml

@@ -26,3 +26,8 @@ postprocess:
     set -xeuo pipefail
     # Transforms /usr/lib/ostree-boot into a bootupd-compatible update payload
     /usr/bin/bootupctl backend generate-update-metadata
+  - |
+    #!/bin/bash
+    # Workaround for https://issues.redhat.com/browse/RHEL-78104
+    set -xeuo pipefail
+    rm -vrf /usr/lib/ostree-boot/loader