WiFi Slice Polish - Searching for WiFi state

1. Change the font color to be secondary
2. Align the left to the AP list title
3. Update the font for Wi-Fi list to be body font - Roboto regular 14dp

Fixes: 124468947
Test: robotest
Change-Id: I9f41925f7e3938bdf3f444b09eab33d6bf479f57

src/com/android/settings/slices/CustomSliceable.java

@@ -54,6 +54,11 @@ import java.lang.reflect.InvocationTargetException;
  */
 public interface CustomSliceable extends Sliceable {
 
+    /**
+     * The color representing not to be tinted for the slice.
+     */
+    int COLOR_NOT_TINTED = -1;
+
     /**
      * @return an complete instance of the {@link Slice}.
      */