GitHub: Add back GLFW

...sigh....

Author: Rikard Olajos

.github/workflows/ubuntu.yml

@@ -35,7 +35,7 @@ jobs:
       run: |
         sudo apt-get update
         #sudo apt-get install -y ninja-build libassimp-dev libglfw3-dev
-        sudo apt-get install -y ninja-build
+        sudo apt-get install -y ninja-build libglfw3-dev
 
     - name: Generate
       env: