[M3][Dialog] Fix dialog icon color tint

Only tints dialog icons when it's an SVG with colorControlNormal, which is the common default color used by vector icons.

PiperOrigin-RevId: 418666657
(cherry picked from commit 246b340)

Author: drchen

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

@@ -130,7 +130,12 @@
     <item name="android:layout_height">@dimen/m3_alert_dialog_icon_size</item>
     <item name="android:layout_marginEnd" tools:ignore="NewApi">@dimen/m3_alert_dialog_icon_margin</item>
     <item name="android:layout_marginRight">@dimen/m3_alert_dialog_icon_margin</item>
-    <item name="tint">?attr/colorSecondary</item>
+    <item name="android:theme">@style/ThemeOverlay.MaterialAlertDialog.Material3.Title.Icon</item>
+  </style>
+
+  <!-- Theme overlay to override icon colors if it's a vector drawable with default colors. -->
+  <style name="ThemeOverlay.MaterialAlertDialog.Material3.Title.Icon" parent="">
+    <item name="colorControlNormal">?attr/colorSecondary</item>
   </style>
 
   <style name="MaterialAlertDialog.Material3.Title.Icon.CenterStacked">