Fix testnet icon (#3726)
Fix testnet icon (#3726)

There is a bug in gdk-pixbuf which prevents ico files from being displayed correctly.
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/86

Fixed by `convert bitcoin_testnet.ico[4] -define icon:auto-resize=256,128,64,48,32,16 bitcoin_testnet.ico`
UdjinM6/dash,dashpay/dash,UdjinM6/dash,dashpay/dash,UdjinM6/dash,thelazier/dash,thelazier/dash,dashpay/dash,thelazier/dash,thelazier/dash,UdjinM6/dash,dashpay/dash,thelazier/dash,UdjinM6/dash,dashpay/dash