fix(sheet): first sheet hidden

[DR-Univer]

• If the first sheet is hidden, we should set the first unhidden sheet to be active.

close #

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 32.93%. Comparing base (e0b49cc) to head (d6eacb9).

Files	Patch %	Lines
packages/core/src/sheets/workbook.ts	63.63%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1538   +/-   ##
=======================================
  Coverage   32.92%   32.93%           
=======================================
  Files         919      919           
  Lines       51083    51089    +6     
  Branches    10627    10628    +1     
=======================================
+ Hits        16820    16825    +5     
- Misses      34263    34264    +1     

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