fix(virtualList): 修复部分场景onScroll不触发

[Alex-huxiyang]

解决在某个时机把列表变少时，无法触发onscroll的问题

• [x] 日常 bug 修复

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.84%. Comparing base (13ead53) to head (216c14d). Report is 3 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2221      +/-   ##
==========================================
- Coverage   85.85%   85.84%   -0.01%     
==========================================
  Files         217      217              
  Lines       22841    22829      -12     
  Branches     2480     2480              
==========================================
- Hits        19610    19598      -12     
  Misses       3226     3226              
  Partials        5        5              

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