Fix dependency hoisting issue

Cause was `electron-app`, because it was still using `latest` for `@theia`
dependencies, `yarn` must have factorised to the best he could, which caused
more issues.

Signed-off-by: Paul Maréchal <paul.marechal@ericsson.com>

electron-app/package.json

@@ -3,30 +3,30 @@
   "name": "electron-app",
   "version": "0.0.0",
   "dependencies": {
-    "@theia/core": "latest",
-    "@theia/filesystem": "latest",
-    "@theia/workspace": "latest",
-    "@theia/preferences": "latest",
-    "@theia/navigator": "latest",
-    "@theia/process": "latest",
-    "@theia/terminal": "latest",
-    "@theia/editor": "latest",
-    "@theia/languages": "latest",
-    "@theia/markers": "latest",
-    "@theia/monaco": "latest",
-    "@theia/typescript": "latest",
-    "@theia/messages": "latest",
+    "@theia/core": "next",
+    "@theia/filesystem": "next",
+    "@theia/workspace": "next",
+    "@theia/preferences": "next",
+    "@theia/navigator": "next",
+    "@theia/process": "next",
+    "@theia/terminal": "next",
+    "@theia/editor": "next",
+    "@theia/languages": "next",
+    "@theia/markers": "next",
+    "@theia/monaco": "next",
+    "@theia/typescript": "next",
+    "@theia/messages": "next",
     "viewer-prototype": "0.0.0"
   },
   "devDependencies": {
-    "@theia/cli": "latest"
+    "@theia/cli": "next"
   },
   "scripts": {
-    "prepare": "theia build --mode development",    
+    "prepare": "theia build --mode development",
     "start": "theia start",
     "watch": "theia build --watch --mode development"
   },
   "theia": {
     "target": "electron"
   }
-}
+}