style: change cell count chart's icon type

[zmcNotafraid]

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Name	Status	Preview	Comments	Updated (UTC)
ckb-explorer-frontend-in-magickbase-repo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 21, 2024 11:07am

[Keith-CY]

Legends on the following pages can be updated too to keep them consistent in style

• https://explorer.nervos.org/charts/average-block-time
• https://explorer.nervos.org/charts/difficulty-hash-rate
• https://explorer.nervos.org/charts/total-dao-deposit
• https://explorer.nervos.org/charts/new-dao-deposit
• https://explorer.nervos.org/charts/inflation-rate
• https://explorer.nervos.org/charts/secondary-issuance
• https://explorer.nervos.org/charts/total-supply

[zmcNotafraid]

Legends on the following pages can be updated too to keep them consistent in style

• https://explorer.nervos.org/charts/average-block-time
• https://explorer.nervos.org/charts/difficulty-hash-rate
• https://explorer.nervos.org/charts/total-dao-deposit
• https://explorer.nervos.org/charts/new-dao-deposit
• https://explorer.nervos.org/charts/inflation-rate
• https://explorer.nervos.org/charts/secondary-issuance
• https://explorer.nervos.org/charts/total-supply

All legend icon change to 'roundRect'