Fix(addons): Align Button with Title in AddonDetailDialog

[am6737]

Description of your changes

Fixes #914

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.02%. Comparing base (2ab672c) to head (76f1131).
Report is 5 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (2ab672c) and HEAD (76f1131). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (2ab672c)	HEAD (76f1131)
apiserver-unittests	1	0
server-e2e-tests	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
- Coverage   59.01%   51.02%   -8.00%     
==========================================
  Files         116      116              
  Lines       19846    16511    -3335     
==========================================
- Hits        11713     8424    -3289     
- Misses       6696     6842     +146     
+ Partials     1437     1245     -192     

Flag	Coverage Δ
apiserver-unittests	?
server-e2e-tests	51.02% <ø> (+2.70%)	⬆️

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[barnettZQG]

LGTM