fix(comp:watermark): prop content type error

[liuzaijiang]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

What is the new behavior?

content: { type: [String, Array] as PropType<string | string[]>, default: undefined, required: true },

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #944 (8d59c93) into main (25e403c) will decrease coverage by 0.44%.
The diff coverage is 46.88%.

❗ Current head 8d59c93 differs from pull request most recent head 3c1c780. Consider uploading reports for the commit 3c1c780 to get more accurate results

@@            Coverage Diff             @@
##             main     #944      +/-   ##
==========================================
- Coverage   93.23%   92.79%   -0.45%     
==========================================
  Files         683      692       +9     
  Lines       67033    67654     +621     
  Branches     7910     7913       +3     
==========================================
+ Hits        62500    62781     +281     
- Misses       4533     4873     +340     

Impacted Files	Coverage Δ
.../cdk/resize/src/resize-observer/ResizeObserver.tsx	36.53% <ø> (ø)
packages/cdk/resize/src/resize-observer/types.ts	100.00% <ø> (ø)
...dk/resize/src/resize-observer/useResizeObserver.ts	95.12% <ø> (ø)
packages/cdk/resize/src/resize-observer/utils.ts	91.48% <ø> (ø)
packages/cdk/resize/src/resizable/useResizable.ts	9.49% <9.49%> (ø)
...ckages/cdk/drag-drop/src/draggable/useDraggable.ts	16.66% <11.11%> (ø)
packages/cdk/drag-drop/src/draggable/Draggable.tsx	28.98% <23.07%> (ø)
packages/cdk/resize/src/resizable/Resizable.tsx	36.00% <36.00%> (ø)
...ages/cdk/resize/src/resizable/ResizableHandler.tsx	43.47% <43.47%> (ø)
packages/cdk/resize/index.ts	97.61% <96.15%> (+1.96%)	⬆️
... and 9 more

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