gtk4-macros: Fix clippy warning

Author: bilelmoussaoui

gtk4-macros/src/composite_template_derive.rs

@@ -188,8 +188,7 @@ pub fn impl_composite_template(input: &syn::DeriveInput) -> Result<TokenStream>
         Err(e) => {
             return Err(Error::new(
                 Span::call_site(),
-                format!("{}: derive(CompositeTemplate) requires #[template(...)] to specify 'file', 'resource', or 'string'",
-                e)
+                format!("{e}: derive(CompositeTemplate) requires #[template(...)] to specify 'file', 'resource', or 'string'")
             ));
         }
     };