`cordova plugin remove` not cleaning `<js-module />` changes.

Don't know if it is a limitation or a lack of dependency tracking but:
```bash
cordova create plugtestapp-a com.test.plugtestapp PlugTestApp \
&& cd plugtestapp-a/ \
&& cordova platform add android@7.1.1 \
&& cd .. \
&& cordova create plugtestapp-b com.test.plugtestapp PlugTestApp \
&& cd plugtestapp-b/ \
&& cordova plugin add cordova-plugin-local-notification \
&& cordova platform add android@7.1.1 \
&& cordova plugin remove cordova-plugin-local-notification \
&& cd .. \
&& diff --recursive plugtestapp-a plugtestapp-b
```

Residual data in:
```
diff plugtestapp-a/platforms/android/platform_www/cordova_plugins.js plugtestapp-b/platforms/android/platform_www/cordova_plugins.js
diff plugtestapp-a/plugins/fetch.json plugtestapp-b/plugins/fetch.json
```

Don't know if it can cause issues on prepared platform while removing plugin with this but I think it could.
And developers are not prepared! At least the documentation should warn developers in order to always make a clean platform prepare before shipping release.

Reproduce the command sequence in the issue, then compare the generated platforms/android/platform_www/cordova_plugins.js and plugins/fetch.json files with the clean app. Start by tracing plugin removal and platform preparation behavior; done means removal leaves no residual plugin data, or the limitation is clearly documented.

Written by the indexing model from the issue text.