fix: Search for all office file types

[juliusknorr]

The file creators only advertise one file format they create, so we need to extend the list so that all office mimes can be found

Signed-off-by: Julius Knorr jus@bitgrid.net

[juliusknorr]

/backport to stable34

[juliusknorr]

/compile

[juliusknorr]

/backport a060ca2 to stable34

[backportbot]

The backport to stable34 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable34
git pull origin stable34

# Create the new backport branch
git checkout -b backport/15/stable34

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick a060ca2

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/15/stable34

Error: Failed to create pull request: Validation Failed: {"resource":"PullRequest","code":"custom","message":"A pull request already exists for nextcloud:backport/15/stable34."} - https://docs.github.com/rest/pulls/pulls#create-a-pull-request

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.