erp5.json: use portal_skin

erp5_/erp5.json

 {
-  "name": "erp5_officejs_onlyoffice_sdkjs",
+  "name": "erp5_onlyoffice_sdkjs",
   "description": "sdkjs - core of OnlyOffice project.",
   "authors": [
     "Ascensio System SIA 2017"
   ],
   "license": "GNU AGPL v3.0",
   "dependencies": [
-    "erp5_officejs",
-    "erp5_officejs_onlyoffice_fonts"
+    "erp5_xhtml_style"
   ],
+  "portal_skin": "erp5_onlyoffice_sdk",
   "scopes": [
     {
       "prefix": "onlyoffice/sdkjs/",