Gate appending electron by meson feature

[gasinvein]

Since the wrapper can be use with non-electron apps, we shouldn't pass Electron-specific cli args to the editor binary unless configured to do so.

Follow-up from #23

[gasinvein]

@noonsleeper Does this look sane to you?

[noonsleeper]

Works like a charm out-of-the-box without any change =) Thanks @gasinvein