Fix build for Mac

scripts/flatpak/com.orcaslicer.OrcaSlicer.yml

@@ -326,6 +326,8 @@ modules:
   - name: OrcaSlicer
     buildsystem: simple
     build-commands:
+      - pip3 install grpcio-tools -q
+      - python3 tools/run_codegen.py
       - |
         cmake . -B build_flatpak \
           -DFLATPAK=ON \
@@ -375,6 +377,9 @@ modules:
       - type: dir
         path: ../../localization
         dest: localization
+      - type: dir
+        path: ../../tools
+        dest: tools
 
       - type: file
         path: ../../CMakeLists.txt