perf(nextcloud): do not use the spread operator for building lists

Signed-off-by: Nikolas Rimikis <leptopoda@users.noreply.github.com>

packages/nextcloud/lib/src/client.dart

@@ -35,18 +35,16 @@ class NextcloudClient extends DynamiteClient {
           baseHeaders: language != null ? {'Accept-Language': language} : null,
           userAgent: userAgentOverride ?? appType.userAgent,
           authentications: [
-            if (appPassword != null) ...[
+            if (appPassword != null)
               DynamiteHttpBearerAuthentication(
                 token: appPassword,
               ),
-            ],
-            if (loginName != null && (password ?? appPassword) != null) ...[
+            if (loginName != null && (password ?? appPassword) != null)
               DynamiteHttpBasicAuthentication(
                 username: loginName,
                 password: (password ?? appPassword)!,
               ),
           ],
-          ],
         );
 
   /// Identifier used for authentication. This can be the username or email or something else.