style: use Self in error enum impls

src/errors/error.rs

@@ -11,7 +11,7 @@ pub enum Error {
 impl Display for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Error::ServerInternal => write!(f, "internal server error"),
+            Self::ServerInternal => write!(f, "internal server error"),
         }
     }
 }
@@ -22,7 +22,7 @@ impl FromStr for Error {
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         Ok(match s {
-            "internal server error" => Error::ServerInternal,
+            "internal server error" => Self::ServerInternal,
             _ => return Err(()),
         })
     }