fix(form): fix buttons misalignment in inline layout

[cipchk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/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?

[x] 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
[x] No

Other information

[codecov]

Codecov Report

Merging #1442 (4809ee3) into master (43595f2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 4809ee3 differs from pull request most recent head 6248e62. Consider uploading reports for the commit 6248e62 to get more accurate results

@@           Coverage Diff           @@
##           master    #1442   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files         265      265           
  Lines        8103     8104    +1     
  Branches     1606     1606           
=======================================
+ Hits         7831     7832    +1     
  Misses        185      185           
  Partials       87       87           

Impacted Files	Coverage Δ
packages/form/src/sf-item.component.ts	100.00% <100.00%> (ø)

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[ng-alain-bot]

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