[DatePicker] icon is inconsistent

[manabu-nakamura]

Is your feature request related to a problem? Please describe.

• https://m3.material.io/components/date-pickers/specs:
  The icon is not toggled (down arrow).
  
  
• https://m3.material.io/components/date-pickers/guidelines:
  The icon is toggled (down arrow and up arrow).
  
  lwhkizck-GM3-Components-DatePickers-Guidelines-2-1-v01.mp4
• 1.13.0-alpha08
  The icon is not toggled (down arrow).
  
  
• (Jetpack Compose)
  The icon is toggled (down arrow and up arrow).
  
  

Describe the solution you'd like
Update the spec (and the implementation).