Fix: prevent event loop error in ROGCC

Leftover code from parts of the refactor and tray crate change were
causing the app to crash due to the UI trying to issue a command on the
slint thread when the slint thread had not been created yet.

Closes #579

rog-platform/src/firmware_attributes.rs

@@ -176,6 +176,9 @@ impl FirmwareAttributes {
             for entry in dir.flatten() {
                 let base_path = entry.path();
                 let name = base_path.file_name().unwrap().to_string_lossy().to_string();
+                if name == "pending_reboot" {
+                    continue;
+                }
                 let help = read_string(&base_path.join("display_name")).unwrap_or_default();
 
                 let (default_value, possible_values, min_value, max_value, scalar_increment) =