Remove current export template version from "Installed Versions"
Remove current export template version from "Installed Versions"

**Not tested** (I don't have an easy way to test currently). Resolves https://github.com/godotengine/godot-proposals/issues/2394 .

(cherry picked from commit c562c6943f86f85d143fa301a5cca0a3eac934ff)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot