Android exporting templates not working with Mono version.

[Oen44]

Godot version:
3.0.6 mono

OS/device including version:
Windows 10 17134.285, 1803

Issue description:
Android exporting doesn't work. Installed export templates but Godot still says that export templates for Android are missing, can't export to APK.

Steps to reproduce:
Install Godot 3.0.6 mono, create project, create example scene, create export for Android, install export templates.

Minimal reproduction project:
None needed.

Tested on no-mono version and templates are working there, Export Project button is enabled and working.

[piratesephiroth]

I think mono exporting is only available for desktop at the moment

#18364 (comment)

[vnen]

Yeah, C# it's not support on Android. See #19839 and #20267.