resolvectl: use pager for help output

src/resolve/resolvectl.c

@@ -3625,6 +3625,8 @@ static int compat_help(void) {
         if (r < 0)
                 return log_oom();
 
+        pager_open(arg_pager_flags);
+
         printf("%1$s [OPTIONS...] HOSTNAME|ADDRESS...\n"
                "%1$s [OPTIONS...] --service [[NAME] TYPE] DOMAIN\n"
                "%1$s [OPTIONS...] --openpgp EMAIL@DOMAIN...\n"
@@ -3682,6 +3684,8 @@ static int native_help(void) {
         if (r < 0)
                 return log_oom();
 
+        pager_open(arg_pager_flags);
+
         printf("%1$s [OPTIONS...] COMMAND ...\n"
                "\n"
                "%5$sSend control commands to the network name resolution manager, or%6$s\n"