fix(cdk:scroll): virtual scroll couldn't scroll under firefox

[sallerli1]

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
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What is the current behavior?

1. 虚拟滚动容器，在firefox中，滚轮滚动失效
2. 横向的虚拟滚动，在firefox中，横向滚动条的宽度不正确

What is the new behavior?

修复以上问题

Other information

在firefox下，添加一个height: 0 的元素并不能真正撑开容器的scrollHeight，需要设置 height 1px

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Additional details and impacted files

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  Files           ?      360           
  Lines           ?    35595           
  Branches        ?     3863           
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  Hits            ?    32286           
  Misses          ?     3309           
  Partials        ?        0           

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