appimage filename problem

[eboye]

Describe the bug

When building appimage, filename defined in desktop file is not the same as the one added to AppDir

To Reproduce

run appimagetool Meshtastic\ Network\ Management\ Client.AppDir

Expected behavior

No errors during build

~/Applications/appimagetool Meshtastic\ Network\ Management\ Client.AppDir
appimagetool, continuous build (commit 8bbf694), build <local dev build> built on 2020-12-31 11:48:33 UTC
Using architecture x86_64
/home/eboye/GitHub/network-management-client/src-tauri/target/release/bundle/appimage/Meshtastic Network Management Client.AppDir should be packaged as Meshtastic_Network_Management_Client-x86_64.AppImage
meshtastic-network-management-client{.png,.svg,.xpm} defined in desktop file but not found
For example, you could put a 256x256 pixel png into
/home/eboye/GitHub/network-management-client/src-tauri/target/release/bundle/appimage/Meshtastic Network Management Client.AppDir/meshtastic-network-management-client.png

the image placed in AppDir folder should have all lowercase letters like such:

meshtastic-network-management-client.png