Remove deprecated trait impls for Error

ctru-rs/src/error.rs

@@ -117,11 +117,7 @@ impl fmt::Display for Error {
     }
 }
 
-impl error::Error for Error {
-    fn description(&self) -> &str {
-        "error originating from a libctru function"
-    }
-}
+impl error::Error for Error {}
 
 fn result_code_level_str(result: ctru_sys::Result) -> Cow<'static, str> {
     use ctru_sys::{

ctru-rs/src/services/ndsp/mod.rs

@@ -293,11 +293,7 @@ impl fmt::Display for NdspError {
     }
 }
 
-impl error::Error for NdspError {
-    fn description(&self) -> &str {
-        "Error caused within the NDSP service wrapper"
-    }
-}
+impl error::Error for NdspError {}
 
 impl<'ndsp> Drop for Channel<'ndsp> {
     fn drop(&mut self) {