fix(CouponList): incorrect list height

[chenjiahan]

#9777

[codecov-commenter]

Codecov Report

Merging #9874 (3f97242) into dev (baa1b0f) will increase coverage by 0.01%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##              dev    #9874      +/-   ##
==========================================
+ Coverage   92.09%   92.11%   +0.01%     
==========================================
  Files         216      216              
  Lines        5569     5577       +8     
  Branches     1363     1363              
==========================================
+ Hits         5129     5137       +8     
  Misses        221      221              
  Partials      219      219              

Impacted Files	Coverage Δ
packages/vant/src/coupon-list/CouponList.tsx	87.93% <94.73%> (+3.93%)	⬆️
packages/vant/src/tabs/Tabs.tsx	87.57% <0.00%> (-0.63%)	⬇️

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