fix: use tabular nums style

PR Checklist

Please check if your PR fulfills the following requirements:

[ ] The commit message follows our guidelines: https://github.com/cipchk/ngx-weui/blob/master/CONTRIBUTING.md#commit
[ ] Tests for the changes have been added (for bug fixes / features)
[ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

Codecov Report

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

Comparison is base (5a74569) 96.85% compared to head (7ca407f) 96.85%.

:exclamation: Current head 7ca407f differs from pull request most recent head 5d892c2. Consider uploading reports for the commit 5d892c2 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #131 +/- ## ======================================= Coverage 96.85% 96.85% ======================================= Files 5 5 Lines 159 159 Branches 27 27 ======================================= Hits 154 154 Misses 4 4 Partials 1 1 ``` | [Flag](https://app.codecov.io/gh/cipchk/ngx-countdown/pull/131/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E5%8D%A1%E8%89%B2) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/cipchk/ngx-countdown/pull/131/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E5%8D%A1%E8%89%B2) | `96.85% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E5%8D%A1%E8%89%B2#carryforward-flags-in-the-pull-request-comment) to find out more.

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cipchk / ngx-countdown