fix(sync): align test_sync_target arg with the config param

src/lib/api.ts

@@ -377,7 +377,7 @@ export const api = {
     invoke<SyncTargetInfo>("update_sync_target", { config }),
   removeSyncTarget: (id: string) => invoke<void>("remove_sync_target", { id }),
   testSyncTarget: (configOrId: SyncTargetConfig | { id: string }) =>
-    invoke<{ ok: boolean; message: string }>("test_sync_target", { configOrId }),
+    invoke<{ ok: boolean; message: string }>("test_sync_target", { config: configOrId }),
   setSyncEnabled: (enabled: boolean) => invoke<void>("set_sync_enabled", { enabled }),
   beginOauthLink: (kind: "onedrive" | "dropbox" | "box") =>
     invoke<{ ok: boolean; account?: string }>("begin_oauth_link", { kind }),