treewide: remove unnecessary types and conversions

Change-Id: Ifcaa9ceeec243b3646c9b6e0a6fad7ef2db8fd90
Reviewed-on: https://review.monogon.dev/c/monogon/+/2954
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/test/launch/launch.go b/metropolis/test/launch/launch.go
index 93e45a6..953025d 100644
--- a/metropolis/test/launch/launch.go
+++ b/metropolis/test/launch/launch.go
@@ -90,7 +90,7 @@
 func IdentityPortMap(ports []uint16) PortMap {
 	portMap := make(PortMap)
 	for _, port := range ports {
-		portMap[port] = uint16(port)
+		portMap[port] = port
 	}
 	return portMap
 }