log: only print error level to syslog/stderr

We only want to print the error level, and not all the levels below
error to stderr/syslog.

Signed-off-by: Gabriel Goller <g.goller@proxmox.com>

proxmox-log/src/lib.rs

@@ -57,7 +57,7 @@ pub fn init_logger(
         .with(
             journald_or_stderr_layer()
                 .with_filter(filter_fn(|metadata| {
-                    !LogContext::exists() || *metadata.level() >= Level::ERROR
+                    !LogContext::exists() || *metadata.level() == Level::ERROR
                 }))
                 .with_filter(log_level),
         )