nayuos: fix grep argument

grep '----- something' fails because of the '-' character
used for passing options:
grep: unrecognized option '----- something'
so only grep for the string 'something'

software/nayuos/instance.cfg

@@ -96,7 +96,7 @@ context =
 recipe = slapos.recipe.template:jinja2
 template = {{ scripts_dir }}/cros_full_build.in
 rendered = ${directory:run}/cros_full_build
-md5sum = d6342b3a578fecd50ef86c6efd7b68bb
+md5sum = 07cde435ed73c5730e928830280639e7
 mode = 0700
 context =
   key bash_path                         bin:bash

software/nayuos/scripts/cros_full_build.in

@@ -132,7 +132,7 @@ increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init/
 
 # bashrc modifications
 BASH_EBUILD_DIR="${PORTAGE_STABLE}/app-shells/bash"
-if ! grep '----- BEGIN NayuOS configuration -----' "${BASH_EBUILD_DIR}/files/dot-bashrc" > /dev/null ; then
+if ! grep "BEGIN NayuOS configuration" "${BASH_EBUILD_DIR}/files/dot-bashrc" > /dev/null ; then
   cat >> "${BASH_EBUILD_DIR}/files/dot-bashrc" <<EOF
 
 # ----- BEGIN NayuOS configuration -----

software/nayuos/software.cfg

@@ -17,7 +17,7 @@ slapos.recipe.template = 2.9
 recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/instance.cfg
 rendered = ${buildout:directory}/instance.cfg
-md5sum = 0d26dd9f3f30504409142c6f701a9221
+md5sum = afb5530b61a60b5061bbbb4606de4b07
 mode = 0644
 scripts_dir = ${:_profile_base_location_}/scripts
 logo_dir = ${:_profile_base_location_}/logo