Fix linux-deb requiring makepkg instead of dpkg

Author: provokateurin

cmd/packaging/linux-deb.go

@@ -35,7 +35,7 @@ var LinuxDebTask = &packagingTask{
 	},
 	requiredTools: map[string]map[string]string{
 		"linux": {
-			"makepkg": "You need to be on Debian, Ubuntu or another distro that uses apt/dpkg as package manager to use this. Installing dpkg on other distros is hard and dangerous.",
+			"dpkg-deb": "You need to be on Debian, Ubuntu or another distro that uses apt/dpkg as package manager to use this. Installing dpkg on other distros is hard and dangerous.",
 		},
 	},
 }