Use variables directly inside format strings

Most systems should have an up to date Rust compiler by now, so we should be
fine.

src/ui/layout.rs

@@ -218,7 +218,7 @@ impl View for Layout {
             // back button + title
             if !self.is_current_stack_empty() {
                 printer.with_color(ColorStyle::title_secondary(), |printer| {
-                    printer.print((1, 0), &format!("< {}", screen_title));
+                    printer.print((1, 0), &format!("< {screen_title}"));
                 });
             }
 
@@ -255,10 +255,7 @@ impl View for Layout {
 
             printer.with_color(style, |printer| {
                 printer.print_hline((0, printer.size.y - cmdline_height), printer.size.x, " ");
-                printer.print(
-                    (0, printer.size.y - cmdline_height),
-                    &format!("ERROR: {}", e),
-                );
+                printer.print((0, printer.size.y - cmdline_height), &format!("ERROR: {e}"));
             });
         }
 

src/ui/library.rs

@@ -83,7 +83,7 @@ impl ViewWrapper for LibraryView {
 impl ViewExt for LibraryView {
     fn title(&self) -> String {
         if let Some(name) = &self.display_name {
-            format!("Library of {}", name)
+            format!("Library of {name}")
         } else {
             "Library".to_string()
         }