test: Update ping test assertions

- Use boolean `true` for successful ping
- Use boolean `false` for ping timeout
- Use boolean `false` for unknown host

lib/osal/core/net_test.v

@@ -7,15 +7,15 @@ fn test_ipaddr_pub_get() {
 
 fn test_ping() {
 	x := ping(address: '127.0.0.1', retry: 1)!
-	assert x == .ok
+	assert x == true
 }
 
 fn test_ping_timeout() ! {
 	x := ping(address: '192.168.145.154', retry: 5, nr_ok: 1)!
-	assert x == .timeout
+	assert x == false
 }
 
 fn test_ping_unknownhost() ! {
 	x := ping(address: '12.902.219.1', retry: 1, nr_ok: 1)!
-	assert x == .unknownhost
+	assert x == false
 }