remove impl_backend_constants parameter

was unused

src/backend/macros.rs

@@ -1,6 +1,6 @@
 #[macro_export]
 macro_rules! impl_backend_constants {
-    ($name:ident) => {
+    () => {
         fn get_binary(&self) -> Text {
             BINARY
         }

src/backend/pacman.rs

@@ -16,7 +16,7 @@ const SWITCHES_INSTALL: Switches = &["-S"];
 const SWITCHES_REMOVE: Switches = &["-Rsn"];
 
 impl Backend for Pacman {
-    impl_backend_constants!(Pacman);
+    impl_backend_constants!();
 
     fn get_all_installed_packages(&self) -> HashSet<Package> {
         convert_to_pacdef_packages(get_all_installed_packages_from_alpm())

src/backend/rust.rs

@@ -13,7 +13,7 @@ const SWITCHES_INSTALL: Switches = &["install"];
 const SWITCHES_REMOVE: Switches = &["uninstall"];
 
 impl Backend for Rust {
-    impl_backend_constants!(Rust);
+    impl_backend_constants!();
 
     fn get_all_installed_packages(&self) -> HashSet<Package> {
         extract_packages_names(&run_cargo_install_list())