build(flatpak): reduce package size

Author: tymmesyde

build-aux/flatpak/build.sh

@@ -5,6 +5,5 @@ cwd="build-aux/flatpak"
 
 python3 $cwd/flatpak-builder-tools/cargo/flatpak-cargo-generator.py Cargo.lock -o $cwd/cargo-sources.json
 
-flatpak-builder --force-clean $cwd/build $package_id.json
-flatpak build-export $cwd/repo $cwd/build
+flatpak-builder --repo=$cwd/repo --force-clean $cwd/build $package_id.json
 flatpak build-bundle $cwd/repo $cwd/$package_id.flatpak $package_id