Arch Linux

Description:
Option flags from ~/.config/electron-flags.conf are nice to change electron's behavior.
Unfortunately, this breaks if an electron application is launched with `--` as parameter, e.g. `electron /usr/lib/element/app.asar --`, as the double dash marks the end of electron options.
This is caused by appending any flags in electron-flags.conf at the end instead of the beginning of the electron parameters.
I propose to add them at the beginning, as they should only affect electron options, nothing application-specific.

This might break for some people, but is a better way going forward IMO.
This is also in line with the electron help:
```
$ electron -h
Usage: electron [options] [path]
[...]
```

In the launcher script:
```
-exec /usr/lib/${name}/electron "$@" "${flags[@]}"
+exec /usr/lib/${name}/electron "${flags[@]}" "$@"
```
Additional Info:
- electron 17.1.0-1 (but any prior electron version does this)