[@theia/electron]: Removed obsolete bin.

The removed module was transformed into a `postinstall` script [here],
but the `bin` entry was not removed from the `package.json`.

[here]: 33be284#diff-3e4f861a7807c5cb7e5f9988b0d4542a

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

dev-packages/electron/package.json

@@ -16,7 +16,6 @@
   "homepage": "https://github.com/eclipse-theia/theia",
   "bin": {
     "electron": "electron-cli.js",
-    "electron-h264-test": "electron-h264-test.js",
     "electron-codecs-test": "electron-codecs-test.js",
     "electron-replace-ffmpeg": "electron-replace-ffmpeg.js"
   },