Fix the tarball creation

Author: certik

Diff for: ci/create_source_tarball0.sh

@@ -9,7 +9,7 @@ cmake -E copy_directory src $dest/src
 cmake -E copy_directory share $dest/share
 cmake -E copy_directory cmake $dest/cmake
 cmake -E copy_directory examples $dest/examples
-cmake -E copy_directory lfortran/src/libasr $dest/lfortran/src/libasr
+cmake -E copy_directory libasr/src/libasr $dest/libasr/src/libasr
 
 # Copy Files:
 cmake -E copy CMakeLists.txt README.md LICENSE lp_version $dest