Fix residual typos found by codespell

[DimitriPapadopoulos]

I have changed a local variable name from:

    for (const auto &activ : activities) {
        const auto json = activ.toObject();

to:

    for (const auto &activity : activities) {
        const auto json = activity.toObject();

[mgallien]

@DimitriPapadopoulos thanks 💙

[codecov]

Codecov Report

Merging #5860 (6cf4dea) into master (e6676ac) will decrease coverage by 0.11%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

❗ Current head 6cf4dea differs from pull request most recent head 09521ed. Consider uploading reports for the commit 09521ed to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5860      +/-   ##
==========================================
- Coverage   60.24%   60.14%   -0.11%     
==========================================
  Files         145      145              
  Lines       18868    18872       +4     
==========================================
- Hits        11367    11350      -17     
- Misses       7501     7522      +21     

Files Changed	Coverage Δ
src/libsync/abstractnetworkjob.h	53.84% <ø> (ø)
src/libsync/discoveryphase.cpp	79.05% <ø> (ø)

... and 9 files with indirect coverage changes

[DimitriPapadopoulos]

The SonarCloud analysis appears to have been broken for quite a long time, and the last error reports don't make any sense or do not seem actionable (such as 1500 new code smells on translation updates).

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-5860-6cf4dea576731005a80232784141c287e498baec-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

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