Use the same shell as invoked with for installation. (#1403)

Fixes #1402

installers/local/install.sh

@@ -60,9 +60,9 @@ done
 
 if [[ -O "${ACCESS_PATH}" ]]; then
   echo "Installing files..."
-  echo "${SCRIPT}" | /usr/bin/bash -eux -
+  echo "${SCRIPT}" | /bin/bash -eux -
 else
   echo "Installing files using sudo..."
-  echo "${SCRIPT}" | sudo -- /usr/bin/bash -eux -
+  echo "${SCRIPT}" | sudo -- /bin/bash -eux -
 fi
 echo "All done."