ci: Use mold from rust-nightly extension in docs job

.gitlab-ci/docs.yml

@@ -4,9 +4,9 @@
     - flatpak
   script:
     - flatpak install --user --noninteractive org.freedesktop.Sdk.Extension.rust-nightly//24.08
-    # We want to use rust-nightly to build the app, but mold is in rust-stable
-    - sed -i 's|"org.freedesktop.Sdk.Extension.rust-stable"|"org.freedesktop.Sdk.Extension.rust-stable","org.freedesktop.Sdk.Extension.rust-nightly"|g' ${MANIFEST_PATH}
-    - sed -i 's|:/usr/lib/sdk/rust-stable/bin|:/usr/lib/sdk/rust-nightly/extra/sdk/rust-nightly/bin|g' ${MANIFEST_PATH}
+    # We want to use rust-nightly to build the app.
+    - sed -i 's|"org.freedesktop.Sdk.Extension.rust-stable"|"org.freedesktop.Sdk.Extension.rust-nightly"|g' ${MANIFEST_PATH}
+    - sed -i 's|/rust-stable/bin|/rust-nightly/extra/sdk/rust-nightly/bin|g' ${MANIFEST_PATH}
     - flatpak-builder --keep-build-dirs --user --disable-rofiles-fuse --stop-at=${FLATPAK_MODULE} flatpak_app --repo=repo ${BRANCH:+--default-branch=$BRANCH} ${MANIFEST_PATH}
     - echo "ninja src/doc" | flatpak-builder --disable-rofiles-fuse --build-shell=${FLATPAK_MODULE} flatpak_app ${MANIFEST_PATH}
     - mv .flatpak-builder/build/${FLATPAK_MODULE}/_flatpak_build/src/doc ${DOCS_FOLDER}