chore: Apply suggestion

Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

Author: Techassi

crates/stackable-operator/src/utils/signal.rs

@@ -5,7 +5,7 @@ use tokio::{
 };
 
 #[derive(Debug, Snafu)]
-#[snafu(display("failed to construct signal listener"))]
+#[snafu(display("failed to construct signal watcher"))]
 pub struct SignalError {
     source: std::io::Error,
 }