fix(files): open sidebar on sharing tab by default for files

[skjnldsv]

Fix #41567
Will fallback to first tab is app is disabled

[nfebe]

Where is the code that opened the activity tab all the time in the past though? 🤔

[skjnldsv]

Where is the code that opened the activity tab all the time in the past though? 🤔

nowhere, the activity is just the first tab

[skjnldsv]

/compile rebase /

[susnux]

/backport to stable30

[susnux]

/backport to stable29

[skjnldsv]

Alright, a slight change.
Seems like sharing was expected for both folder and files (legacy)

I'll raise that question on the linked ticket for the design team.
in the meantime, this fixes a few things, so let's get this in

[backportbot]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/49147/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 191e839a f29697a7 d432fea3

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/49147/stable29

Error: No changes found in backport branch

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