Fix some typo in the github action for generating TGV data (#334)

Author: mathrack

.github/workflows/generate_reference_test_data.yml

@@ -48,12 +48,12 @@ jobs:
         ctest --test-dir build --rerun-failed --output-on-failure
     - name: Store new reference output
       run: |
-        cp -v build/RunTests/RunTests/TGV-Taylor-Green-vortex/time_evol.dat tests/TGV-Taylor-Green-Vortex/reference_time_evol.dat
+        cp -v build/RunTests/RunTests/TGV-Taylor-Green-vortex/time_evol.dat tests/TGV-Taylor-Green-vortex/reference_time_evol.dat
     - name: Create new Pull Request updating the reference output
       uses: peter-evans/create-pull-request@v4
       with:
         title: Update reference output TGV data
         commit-message: Update reference TGV data and metadata
         add-paths: |
-          tests/TGV-Taylor-Green-Vortex/reference_time_evol.dat
-          tests/TGV-Taylor-Green-Vortex/metadata.txt
+          tests/TGV-Taylor-Green-vortex/reference_time_evol.dat
+          tests/TGV-Taylor-Green-vortex/metadata.txt