fix typo in tar command

Signed-off-by: Ava Affine <ava@sunnypup.io>

.gitlab-ci.yml

@@ -37,9 +37,9 @@ prepare-release:
     - cargo build -F implicit-load --release
     - |
       tar -czf flesh-$CI_COMMIT_TAG.tar.gz \
-        --xform='s,target/release/,,'
-        --xform='s,snippets/,,'
-        --xform='s,snippets/release/,,'
+        --xform='s,target/release/,,' \
+        --xform='s,snippets/,,' \
+        --xform='s,snippets/release/,,' \
         target/release/flesh \
         Readme.org Writing.org Shell.org \
         snippets/flesh-mode.el \