fix yaml commenting-out of R code

Author: perrydv

.github/workflows/test-all.yaml

@@ -54,10 +54,10 @@ jobs:
       - name: Run nCompile and other tests
         run: |
           library(nCompiler)
-#          testthat::test_dir("nCompiler/tests/testthat/uncompiled_tests", reporter = "summary")
-#          testthat::test_dir("nCompiler/tests/testthat/nCompile_tests", reporter = "summary")
+          # testthat::test_dir("nCompiler/tests/testthat/uncompiled_tests", reporter = "summary")
+          # testthat::test_dir("nCompiler/tests/testthat/nCompile_tests", reporter = "summary")
           testthat::test_dir("nCompiler/tests/testthat/cpp_tests", reporter = "location")
-        shell: Rscript {0}
+        Shell: Rscript {0}
 
   test-nCompile-features:
     runs-on: ubuntu-latest