Refactor comparison logic in FeatureManager and SettingManager to use string.Equals for fallback value checks

modules/feature-management/src/Volo.Abp.FeatureManagement.Domain/Volo/Abp/FeatureManagement/FeatureManager.cs

@@ -152,7 +152,7 @@ public class FeatureManager : IFeatureManager, ISingletonDependency
             await using (await providers[0].HandleContextAsync(providerName, providerKey))
             {
                 var fallbackValue = await GetOrNullInternalAsync(name, providers[1].Name, null);
-                if (fallbackValue.Value.Equals(value, StringComparison.OrdinalIgnoreCase))
+                if (string.Equals(fallbackValue.Value, value, StringComparison.OrdinalIgnoreCase))
                 {
                     //Clear the value if it's same as it's fallback value
                     value = null;

modules/setting-management/src/Volo.Abp.SettingManagement.Domain/Volo/Abp/SettingManagement/SettingManager.cs

@@ -136,7 +136,7 @@ public class SettingManager : ISettingManager, ISingletonDependency
         if (providers.Count > 1 && !forceToSet && setting.IsInherited && value != null)
         {
             var fallbackValue = await GetOrNullInternalAsync(name, providers[1].Name, null);
-            if (fallbackValue.Equals(value, StringComparison.OrdinalIgnoreCase))
+            if (string.Equals(fallbackValue, value, StringComparison.OrdinalIgnoreCase))
             {
                 //Clear the value if it's same as it's fallback value
                 value = null;