fix keepalive setting

dist/aicc.js

@@ -688,7 +688,9 @@ var BaseAPI = /*#__PURE__*/function () {
               break;
           }
         },
-        fetchKeepalive: function fetchKeepalive() {}
+        fetchKeepalive: function fetchKeepalive() {
+          return true;
+        }
       }
     });
 

dist/scorm-again.js

@@ -688,7 +688,9 @@ var BaseAPI = /*#__PURE__*/function () {
               break;
           }
         },
-        fetchKeepalive: function fetchKeepalive() {}
+        fetchKeepalive: function fetchKeepalive() {
+          return true;
+        }
       }
     });
 

dist/scorm12.js

@@ -563,7 +563,9 @@ var BaseAPI = /*#__PURE__*/function () {
               break;
           }
         },
-        fetchKeepalive: function fetchKeepalive() {}
+        fetchKeepalive: function fetchKeepalive() {
+          return true;
+        }
       }
     });
 

dist/scorm2004.js

@@ -563,7 +563,9 @@ var BaseAPI = /*#__PURE__*/function () {
               break;
           }
         },
-        fetchKeepalive: function fetchKeepalive() {}
+        fetchKeepalive: function fetchKeepalive() {
+          return true;
+        }
       }
     });