fix(pro:search): rest count should hide when no item is overflowed

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

当没有任何搜索项溢出容器时，异常展示 +0

What is the new behavior?

没有任何搜索项溢出时，不应当展示 rest

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1736 (eb797ba) into main (873d214) will increase coverage by 0.00%.
Report is 1 commits behind head on main.
The diff coverage is 66.66%.

❗ Current head eb797ba differs from pull request most recent head 5ae6772. Consider uploading reports for the commit 5ae6772 to get more accurate results

@@           Coverage Diff           @@
##             main    #1736   +/-   ##
=======================================
  Coverage   92.31%   92.31%           
=======================================
  Files         346      346           
  Lines       32781    32784    +3     
  Branches     3704     3709    +5     
=======================================
+ Hits        30261    30266    +5     
+ Misses       2520     2518    -2     

Files	Coverage Δ
packages/components/_private/overflow/src/Item.tsx	100.00% <100.00%> (ø)
packages/components/_private/overflow/src/types.ts	100.00% <100.00%> (ø)
...ages/components/_private/overflow/src/Overflow.tsx	85.04% <83.33%> (+2.47%)	⬆️
packages/pro/search/src/ProSearch.tsx	15.56% <0.00%> (-0.25%)	⬇️