msbuild: remove output response file

pkgs/development/tools/build-managers/msbuild/default.nix

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     # msbuild response files to use only the nixos source
     echo "/p:RestoreSources=nixos" > artifacts/mono-msbuild/MSBuild.rsp
-    echo "/p:RestoreSources=nixos" > src/MSBuild/MSBuild.rsp
 
     # not patchShebangs, there is /bin/bash in the body of the script as well
     substituteInPlace ./eng/cibuild_bootstrapped_msbuild.sh --replace /bin/bash ${stdenv.shell}