Fix Ubuntu WebAssembly workflow

Author: Julian LALU

.github/workflows/ubuntu_wasm.yml

@@ -15,8 +15,8 @@ jobs:
           git clone https://github.com/emscripten-core/emsdk.git
           cd emsdk
           git pull
-          emsdk install latest
-          emsdk activate latest
+          ./emsdk install latest
+          ./emsdk activate latest
       - name: Generate
         run: |
           source ./emsdk_env.sh