Update index.d.ts

The type should not point to the source code, which will cause the upper layer to rely on the compilation type to report an error

Author: lzxb

index.d.ts

@@ -1,2 +1,2 @@
-export * from './src/zrender';
-export * from './src/export';
+export * from './lib/zrender';
+export * from './lib/export';