chore: fix Rust 1.91.0 lint for derivable Default

src/ephemeral.rs

@@ -88,9 +88,10 @@ use crate::tools::{SystemTime, duration_to_str, time};
 use crate::{location, stats};
 
 /// Ephemeral timer value.
-#[derive(Debug, PartialEq, Eq, Copy, Clone, Serialize, Deserialize)]
+#[derive(Debug, PartialEq, Eq, Copy, Clone, Serialize, Deserialize, Default)]
 pub enum Timer {
     /// Timer is disabled.
+    #[default]
     Disabled,
 
     /// Timer is enabled.
@@ -125,12 +126,6 @@ impl Timer {
     }
 }
 
-impl Default for Timer {
-    fn default() -> Self {
-        Self::Disabled
-    }
-}
-
 impl fmt::Display for Timer {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.to_u32())