fix: error on set placeholder partially

[ryo-gk]

This PR fixes the issue that it causes the error when we set the placeholder to SInputYMD and SInputHMS partially.

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (90bb10c) 80.32% compared to head (d872f58) 80.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   80.32%   80.32%           
=======================================
  Files         114      114           
  Lines        9887     9887           
  Branches      411      411           
=======================================
  Hits         7942     7942           
  Misses       1945     1945           

Impacted Files	Coverage Δ
lib/components/SInputHMS.vue	100.00% <100.00%> (ø)
lib/components/SInputYMD.vue	100.00% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
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[kiaking]

We need to update the Placeholder types as well since they are not nullable 👀 It should be:

export interface Placeholder {
  hour?: string
  minute?: string
  second?: string
}

[kiaking]

Same goes for SInputYMD too 👀

[ryo-gk]

Ah, I mistook the Placeholder in SInputYMD for Value and thought it was okay. 😓
I fixed it.