Supply custom .desktop file for .deb builds to fix icons under GNOME (#1917)

Author: nabijaczleweli

desktop/package/linux/jpackage.deb/Haveno.desktop

@@ -0,0 +1,11 @@
+[Desktop Entry]
+Name=Haveno
+GenericName=Monero Exchange
+Comment=A decentralized monero exchange network.
+Exec=/opt/haveno/bin/Haveno
+Icon=/opt/haveno/lib/Haveno.png
+Terminal=false
+Type=Application
+Categories=Network
+MimeType=
+StartupWMClass=haveno.desktop.app.HavenoApp

desktop/package/package.gradle

@@ -321,6 +321,7 @@ task packageInstallers {
 
             // Package deb
             executeCmd(jPackageFilePath + commonOpts + linuxOpts +
+                    " --resource-dir \"${project(':desktop').projectDir}/package/linux/jpackage.deb\"" +
                     " --linux-deb-maintainer noreply@haveno.exchange" +
                     " --type deb")