Fix activity list nft url.

[felix-zhaolei]

fix activity list nft url.
Issue: #341

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 54.05%. Comparing base (639781c) to head (f5c0513).

Files	Patch %	Lines
...r.Application/CAActivity/UserActivityAppService.cs	28.57%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
- Coverage   54.07%   54.05%   -0.02%     
==========================================
  Files         773      773              
  Lines       26756    26763       +7     
  Branches     2249     2252       +3     
==========================================
+ Hits        14467    14468       +1     
- Misses      11578    11583       +5     
- Partials      711      712       +1     

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