Fixed: Saving indexer, download client, etc settings

(cherry picked from commit 804a5921b3b620e2407d5d6a7fd69fb1fd9b0cbf)

src/Radarr.Api.V3/ProviderControllerBase.cs

@@ -90,7 +90,9 @@ namespace Radarr.Api.V3
             var providerDefinition = GetDefinition(providerResource, existingDefinition, true, !forceSave, false);
 
             // Comparing via JSON string to eliminate the need for every provider implementation to implement equality checks.
-            var hasDefinitionChanged = STJson.ToJson(existingDefinition) != STJson.ToJson(providerDefinition);
+            // Compare settings separately because they are not serialized with the definition.
+            var hasDefinitionChanged = STJson.ToJson(existingDefinition) != STJson.ToJson(providerDefinition) ||
+                                       STJson.ToJson(existingDefinition.Settings) != STJson.ToJson(providerDefinition.Settings);
 
             // Only test existing definitions if it is enabled and forceSave isn't set or the definition has changed.
             if (providerDefinition.Enable && (!forceSave || hasDefinitionChanged))