New installer cannot be launched via welcome

[fossfreedom]

https://github.com/UbuntuBudgie/budgie-welcome/blob/7858d1ce5a0f7485572c7c342a2e7f8851893df0/budgie-welcome#L1367

Need to check the above works for the new ISO and tweak that bit of the python code to identify when welcome is running on the new ISO live session

The new installer cannot be launched via welcome

https://github.com/UbuntuBudgie/budgie-welcome/blob/7858d1ce5a0f7485572c7c342a2e7f8851893df0/budgie-welcome#L433

Need to tweak the above code to run the new snap installer - look to see how the menu "install" desktop file launches the snap