[M3][Dialog] Start-align message text with centered styles

According to the spec the centered dialog theme overlay should have message text start-aligned and it's also the previous behavior in old MaterialComponent theme overlay.

Spec: https://m3.material.io/components/dialogs/specs
PiperOrigin-RevId: 413671708

Author: drchen

lib/java/com/google/android/material/dialog/res/values/themes.xml

@@ -159,7 +159,6 @@
     <item name="materialAlertDialogTitlePanelStyle">@style/MaterialAlertDialog.Material3.Title.Panel.CenterStacked</item>
     <item name="materialAlertDialogTitleIconStyle">@style/MaterialAlertDialog.Material3.Title.Icon.CenterStacked</item>
     <item name="materialAlertDialogTitleTextStyle">@style/MaterialAlertDialog.Material3.Title.Text.CenterStacked</item>
-    <item name="materialAlertDialogBodyTextStyle">@style/MaterialAlertDialog.Material3.Body.Text.CenterStacked</item>
   </style>
 
 </resources>