app.js: failed to load wasm module

[podsvirov]

To reproduse:

git clone https://github.com/flecs-hub/explorer.git
python -m http.server
chrome http://localhost:8000/explorer/etc/index.html

Then, in browser console we see:

app.js:  failed to load wasm module http://localhost:8000//explorer/etc/index.html/flecs_explorer.js

Looks like, the this.wasm_url is wrong computed for this case.