fix: canvasKit not loaded on web

Signed-off-by: OctagonalStar <[email protected]>

Author: OctagonalStar

web/flutter_bootstrap.js

@@ -6,7 +6,7 @@ document.body.appendChild(loading);
 loading.textContent = "正在加载中(Step 1)...\n若长时间无响应请尝试更换网络";
 _flutter.loader.load({
     config: {
-        'canvasKitBaseUrl': '/canvaskit/',
+        'canvasKitBaseUrl': '/arabic_learning/canvaskit/',
     },
     serviceWorkerSettings: {
         serviceWorkerVersion: {{flutter_service_worker_version}},