Fix quote

Author: hiroyuki-sato

ci/scripts/cpp_build.sh

@@ -103,7 +103,7 @@ mkdir -p "${build_dir}"
 pushd "${build_dir}"
 
 if [ "${ARROW_OFFLINE}" = "ON" ]; then
-  "${source_dir}/thirdparty/download_dependencies.sh" "${PWD}"/thirdparty > \
+  "${source_dir}/thirdparty/download_dependencies.sh" "${PWD}/thirdparty" > \
     enable_offline_build.sh
   # shellcheck source=/dev/null
   . enable_offline_build.sh
@@ -169,7 +169,7 @@ elif [ "${ARROW_EMSCRIPTEN:-OFF}" = "ON" ]; then
   # emcmake so we unset them
   unset LDFLAGS CFLAGS CXXFLAGS CPPFLAGS
   emcmake cmake \
-    --preset=ninja-"${ARROW_BUILD_TYPE:-debug}-emscripten" \
+    --preset="ninja-${ARROW_BUILD_TYPE:-debug}-emscripten" \
     -DCMAKE_VERBOSE_MAKEFILE="${CMAKE_VERBOSE_MAKEFILE:-OFF}" \
     -DCMAKE_C_FLAGS="${CFLAGS:-}" \
     -DCMAKE_CXX_FLAGS="${CXXFLAGS:-}" \