fix: convert test with new defaults

Author: jokerttu

android/src/main/kotlin/com/google/maps/flutter/navigation/Convert.kt

@@ -363,6 +363,7 @@ object Convert {
    */
   fun convertDisplayOptionsFromDto(displayOptions: NavigationDisplayOptionsDto): DisplayOptions {
     return DisplayOptions().apply {
+      // Only set if explicitly provided, otherwise SDK defaults are used.
       if (displayOptions.showDestinationMarkers != null) {
         this.hideDestinationMarkers(!displayOptions.showDestinationMarkers)
       }

android/src/test/kotlin/com/google/maps/flutter/navigation/ConvertTest.kt

@@ -153,8 +153,9 @@ internal class ConvertTest {
       )
 
     val convertedNone = Convert.convertDisplayOptionsFromDto(none)
-    assertEquals(false, convertedNone.showStopSigns)
-    assertEquals(false, convertedNone.showTrafficLights)
+    // When not specified, SDK defaults are used: stop signs and traffic lights are shown
+    assertEquals(true, convertedNone.showStopSigns)
+    assertEquals(true, convertedNone.showTrafficLights)
     assertEquals(false, convertedNone.hideDestinationMarkers)
 
     val convertedAllFalse = Convert.convertDisplayOptionsFromDto(allFalse)