Revert "ci: disable vid build for now"

This reverts commit e3ad367b80.

.github/workflows/ci.yml

@@ -21,10 +21,10 @@ jobs:
       run: ./v test v
     - name: Test v->js
       run: ./v -o hi.js examples/hello_v_js.v && node hi.js
-#    - name: Test vid
-#      run: |
-#        git clone --depth 1 https://github.com/vlang/vid.git
-#        cd vid && ../v -o vid .
+    - name: Test vid
+      run: |
+        git clone --depth 1 https://github.com/vlang/vid.git
+        cd vid && ../v -o vid .
 
   build-ubuntu:
     runs-on: ubuntu-18.04