Fix editor and linting config for package manifest

I forgot to commit this in 05b858b.

.editorconfig

@@ -14,6 +14,6 @@ indent_style = space
 indent_size = 2
 
 # Python
-[{*.py,eos-image-builder,run-build,helpers/{assemble-manifest,fetch-remote-collection-id,generate-ovf-files,kill-chroot-procs,kolibri-pick-content-from-channel,mutable-path,packages-manifest,seed-kolibri-channels},hooks/{content/50-flatpak,image/{50-flatpak.chroot,52-ek-content-cache,62-kolibri-options,70-flatpak-appstream-catalog,70-flatpak-manifest,70-ostree-manifest}}}]
+[{*.py,eos-image-builder,run-build,helpers/{assemble-manifest,fetch-remote-collection-id,generate-ovf-files,kill-chroot-procs,kolibri-pick-content-from-channel,mutable-path,seed-kolibri-channels},hooks/{content/50-flatpak,image/{50-flatpak.chroot,52-ek-content-cache,62-kolibri-options,70-flatpak-appstream-catalog,70-flatpak-manifest,70-ostree-manifest,70-packages-manifest}}}]
 indent_size = 4
 max_line_length = 88

.flake8

@@ -12,12 +12,12 @@ filename =
     ./helpers/kill-chroot-procs,
     ./helpers/kolibri-pick-content-from-channel,
     ./helpers/mutable-path,
-    ./helpers/packages-manifest,
     ./helpers/seed-kolibri-channels,
     ./hooks/content/50-flatpak,
     ./hooks/image/50-flatpak.chroot,
     ./hooks/image/62-kolibri-options,
     ./hooks/image/70-flatpak-appstream-catalog,
     ./hooks/image/70-flatpak-manifest,
     ./hooks/image/70-ostree-manifest,
+    ./hooks/image/70-packages-manifest,
     ./run-build