Ship MI-GAN's bare 512 generator as the panorama border filler

Sargsyan et al., ICCV 2023; MIT code and weights (models/LICENCE.md),
exported by tools/export-migan.sh at a fixed 1×4×512×512 from the
authors' checkpoint — six operator types, 28 MB, in LFS like the rest.
The package installs it beside the scene model and the APK unpacks it
with the others.

docker/android/assemble-apk.sh

@@ -299,7 +299,7 @@ fi
 rm -rf "${OUT}/staging/assets/models"
 mkdir -p "${OUT}/staging/assets/models"
 _bundled=""
-for _dir in face scene; do
+for _dir in face scene inpaint; do
     ASSETS="${REPO}/models/${_dir}"
     compgen -G "${ASSETS}/*.onnx" >/dev/null || continue
     # An LFS pointer is ~130 bytes and looks exactly like a model to `cp`. Left