chore: update template icon

[LucasXu0]

Feature Preview

Update the template icon, no test required.

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.08%. Comparing base (7ecf213) to head (f973e39).
Report is 235 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6767      +/-   ##
==========================================
- Coverage   74.41%   65.08%   -9.33%     
==========================================
  Files         245      273      +28     
  Lines        6566    10572    +4006     
  Branches     1057     1413     +356     
==========================================
+ Hits         4886     6881    +1995     
- Misses       1628     3517    +1889     
- Partials       52      174     +122     

Flag	Coverage Δ
appflowy_web_app	65.08% <ø> (-9.33%)	⬇️

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