Update dotbot install file to match current dotbot practices

Author: lainiwa

install

@@ -9,6 +9,7 @@ DOTBOT_BIN="bin/dotbot"
 BASEDIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
 
 cd "${BASEDIR}"
+git -C "${DOTBOT_DIR}" submodule sync --quiet --recursive
 git submodule update --init --recursive "${DOTBOT_DIR}"
 
 "${BASEDIR}/${DOTBOT_DIR}/${DOTBOT_BIN}" -d "${BASEDIR}" -c "${CONFIG}" "${@}"