Fix building web-apps by require sdkjs (#725)
Fix building web-apps by require sdkjs (#725)

Since this commit on develop
https://github.com/ONLYOFFICE/web-apps/commit/3636bf78c4bd2e05f180b66b82000f4ceac2c9e4
web-apps require file from `sdkjs` named
```
'../../../../sdkjs/common/device_scale.js'
```
So cloning of sdkjs is bring back
Currently it will close `sdkjs#develop` for any branches,
since implement cloning different branches for different
PR destanation in GitHub Actions is not a trivial task and
will take time to develop.
But maybe current variant will be enough in major cases
ONLYOFFICE/web-apps,ONLYOFFICE/web-apps,ONLYOFFICE/web-apps,ONLYOFFICE/web-apps