Fix clippy::needless_lifetimes warnings on nightly

The warnings in `derivative`'s derived code are not something we can fix.

src/display/components/header_details.rs

@@ -40,7 +40,7 @@ pub struct HeaderDetails<'a> {
     pub paused: bool,
 }
 
-impl<'a> HeaderDetails<'a> {
+impl HeaderDetails<'_> {
     pub fn render(&self, frame: &mut Frame, rect: Rect) {
         let bandwidth = self.bandwidth_string();
         let color = if self.paused {

src/display/components/layout.rs

@@ -30,7 +30,7 @@ pub struct Layout<'a> {
     pub footer: HelpText,
 }
 
-impl<'a> Layout<'a> {
+impl Layout<'_> {
     fn progressive_split(&self, rect: Rect, splits: Vec<Direction>) -> Vec<Rect> {
         splits
             .into_iter()