Fix clippy::string-lit-as-bytes

src/database/sending.rs

@@ -210,7 +210,7 @@ impl Sending {
                                     }
 
                                     let mut prefix = if *is_appservice {
-                                        "+".as_bytes().to_vec()
+                                        b"+".to_vec()
                                     } else {
                                         Vec::new()
                                     };
@@ -248,7 +248,7 @@ impl Sending {
 
     #[tracing::instrument(skip(self))]
     pub fn send_pdu_appservice(&self, appservice_id: &str, pdu_id: &[u8]) -> Result<()> {
-        let mut key = "+".as_bytes().to_vec();
+        let mut key = b"+".to_vec();
         key.extend_from_slice(appservice_id.as_bytes());
         key.push(0xff);
         key.extend_from_slice(pdu_id);