Fix syntax

Author: cannam

.github/workflows/windows.yml

@@ -31,6 +31,8 @@ jobs:
       run: |
         msbuild otherbuilds\rubberband-library.vcxproj /t:Build /p:Configuration=Release
     - name: dotnet
+      run: |
         msbuild dotnet\rubberband.sln /t:Restore;Build
     - name: single
+      run: |
         cl main\main.cpp single\RubberBandSingle.cpp .\src\ext\getopt\getopt.c src\ext\getopt\getopt_long.c "C:\Program Files\libsndfile\lib\sndfile.lib" /O2 /std:c++14 /D_USE_MATH_DEFINES /DNOMINMAX /EHs /I"C:\Program Files\libsndfile\include" /link /out:test_single.exe