Fix #21740.
Updated the Pull Request template so that the 'Update branch by merge'
button is visible for WIP PR's. Making the behaviour match a non WIP-PR.
Previous WIP page with changes pending on the branch:
![image](https://user-images.githubusercontent.com/1656302/215738307-e68a2f92-5ff8-4f48-a541-35ca81d1f1a4.png)
Updated UI adding the update button:
![image](https://user-images.githubusercontent.com/1656302/215737872-e0e9d712-b7aa-4b90-b7ed-6a92a14fc182.png)
## Notes
* have not removed the **$canAutoMerge** variable from the pull.tmpl on
this
[line](
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.. | ||
actions | ||
branch | ||
cite | ||
diff | ||
editor | ||
find | ||
graph | ||
issue | ||
migrate | ||
projects | ||
pulls | ||
release | ||
settings | ||
wiki | ||
activity.tmpl | ||
blame.tmpl | ||
branch_dropdown.tmpl | ||
clone_buttons.tmpl | ||
clone_script.tmpl | ||
commit_page.tmpl | ||
commit_status.tmpl | ||
commit_statuses.tmpl | ||
commits.tmpl | ||
commits_list.tmpl | ||
commits_list_small.tmpl | ||
commits_table.tmpl | ||
create.tmpl | ||
create_helper.tmpl | ||
empty.tmpl | ||
file_info.tmpl | ||
forks.tmpl | ||
graph.tmpl | ||
header.tmpl | ||
home.tmpl | ||
icon.tmpl | ||
packages.tmpl | ||
search.tmpl | ||
shabox_badge.tmpl | ||
sub_menu.tmpl | ||
unicode_escape_prompt.tmpl | ||
upload.tmpl | ||
user_cards.tmpl | ||
view_file.tmpl | ||
view_list.tmpl | ||
watchers.tmpl |