Revert "chore: move electron as dep instead of dev-dep"

This reverts commit b3f3cc0.

package.json

@@ -124,7 +124,6 @@
   },
   "dependencies": {
     "babel-plugin-transform-class-properties": "^6.24.1",
-    "electron": "5.0.2",
     "electron-context-menu": "^0.12.0",
     "electron-context-menu-handler": "^1.0.3",
     "electron-debug": "^3.0.0",
@@ -165,6 +164,7 @@
     "css-loader": "2.1.1",
     "css-to-string-loader": "0.1.3",
     "cz-conventional-changelog": "2.1.0",
+    "electron": "5.0.2",
     "electron-builder": "20.41.0",
     "electron-devtools-installer": "2.2.4",
     "electron-mocha": "8.0.2",