go through a ton of pedantic clippy lints

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/database/key_value/appservice.rs

@@ -13,7 +13,7 @@ impl service::appservice::Data for KeyValueDatabase {
         self.cached_registrations
             .write()
             .unwrap()
-            .insert(id.to_owned(), yaml.to_owned());
+            .insert(id.to_owned(), yaml.clone());
 
         Ok(id.to_owned())
     }
@@ -67,7 +67,7 @@ impl service::appservice::Data for KeyValueDatabase {
 
     fn all(&self) -> Result<Vec<(String, Registration)>> {
         self.iter_ids()?
-            .filter_map(|id| id.ok())
+            .filter_map(std::result::Result::ok)
             .map(move |id| {
                 Ok((
                     id.clone(),