Make UserConfigService.update param partial

Update UserConfigService.update() to accept any subset of the updatable fields.
Remove the unnecessary userConfig object from  DBService.initialSetup()

src/server/database/repositories/userConfig/service.ts

@@ -54,7 +54,7 @@ export class UserConfigService {
     });
   }
 
-  update(data: UserConfigUpdateType) {
+  update(data: Partial<UserConfigUpdateType>) {
     return this.#db
       .update(userConfig)
       .set(data)

src/server/database/sqlite.ts

@@ -89,18 +89,14 @@ async function initialSetup(db: DBServiceType) {
 
   if (WG_INITIAL_ENV.DNS) {
     DB_DEBUG('Setting initial DNS...');
-    const userConfig = await db.userConfigs.get();
     await db.userConfigs.update({
-      ...userConfig,
       defaultDns: WG_INITIAL_ENV.DNS,
     });
   }
 
   if (WG_INITIAL_ENV.ALLOWED_IPS) {
     DB_DEBUG('Setting initial Allowed IPs...');
-    const userConfig = await db.userConfigs.get();
     await db.userConfigs.update({
-      ...userConfig,
       defaultAllowedIps: WG_INITIAL_ENV.ALLOWED_IPS,
     });
   }