[google_maps_flutter_web] Prevent style conflict with cloudMapId

Fixes #161951

When a 'cloudMapId' is used, the Google Maps JS API does not allow the `styles` property to be set on the map options.

This change modifies the `_configurationAndStyleToGmapsOptions` method
to ensure that the `styles` property is only applied when
`configuration.mapId` is null. This resolves the console warning and
allows cloud-based styling to work as intended.

Author: WillBLogical

packages/google_maps_flutter/google_maps_flutter_web/lib/src/convert.dart

@@ -95,15 +95,17 @@ gmaps.MapOptions _configurationAndStyleToGmapsOptions(
     options.rotateControl = configuration.fortyFiveDegreeImageryEnabled;
   }
 
+  // If using cloud map, do not set options.styles
+  if (configuration.cloudMapId == null) {
+    options.styles = styles;
+  }
+
   // These don't have any configuration entries, but they seem to be off in the
   // native maps.
   options.mapTypeControl = false;
   options.fullscreenControl = false;
   options.streetViewControl = false;
 
-  // See updateMapConfiguration for why this is not using configuration.style.
-  options.styles = styles;
-
   options.mapId = configuration.cloudMapId;
 
   return options;