fix(CalendarPickerView): Fix empty header cell for some month

[zombieJ]

fix #6658

[github-actions]

Size Change: +30 B (+0.01%)

Total Size: 356 kB

Filename	Size	Change
./lib/bundle/antd-mobile.compatible.umd.js	191 kB	+14 B (+0.01%)
./lib/bundle/antd-mobile.umd.js	146 kB	+16 B (+0.01%)

ℹ️ View Unchanged

Filename	Size
./lib/bundle/css-vars-patch.css	1.42 kB
./lib/bundle/style.css	18 kB

_{compressed-size-action}

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
./lib/bundle/antd-mobile.es.js	102.86 KB (-35 B 🔽)	2.1 s (-0.04% 🔽)	1.3 s (+6.43% 🔺)	3.3 s

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6661.surge.sh