Remove extra system.hostname property from /api/sysinfo. It is already contained as system.uname.nodename of the very same API endpoint

Signed-off-by: DL6ER <dl6er@dl6er.de>

src/api/docs/content/specs/ftl.yaml

@@ -302,11 +302,6 @@ components:
               description: Device model (if available, `null` otherwise)
               example: "Raspberry Pi Model 4B"
               nullable: true
-            hostname:
-              type: string
-              nullable: true
-              description: Hostname of the device
-              example: "raspberrypi"
             dns:
               $ref: 'dns.yaml#/components/schemas/blocking'
             uname:

src/api/ftl.c

@@ -378,16 +378,6 @@ int get_system_obj(struct ftl_conn *api, cJSON *system)
 	if(f_model)
 		fclose(f_model);
 
-	// Add hostname to system object
-	char hostname[256] = { 0 };
-	if(gethostname(hostname, sizeof(hostname)) != 0)
-	{
-		log_warn("gethostname() failed: %s", strerror(errno));
-		JSON_ADD_NULL_TO_OBJECT(system, "hostname");
-	}
-	else
-		JSON_COPY_STR_TO_OBJECT(system, "hostname", hostname);
-
 	cJSON *dns = JSON_NEW_OBJECT();
 	const bool blocking = get_blockingstatus();
 	JSON_ADD_BOOL_TO_OBJECT(dns, "blocking", blocking); // same reply type as in /api/dns/status