Remove some last AccountId32::default() leftovers (#10655)

* Remove some last `AccountId32::default()` leftovers

As we removed `Default` of account id, we have overseen some last bits. This pr removes these last
bits.

* Fix

substrate/frame/collective/src/lib.rs

@@ -990,8 +990,8 @@ where
 pub struct EnsureMember<AccountId, I: 'static>(PhantomData<(AccountId, I)>);
 impl<
 		O: Into<Result<RawOrigin<AccountId, I>, O>> + From<RawOrigin<AccountId, I>>,
-		AccountId: Default,
 		I,
+		AccountId: Decode,
 	> EnsureOrigin<O> for EnsureMember<AccountId, I>
 {
 	type Success = AccountId;
@@ -1004,7 +1004,10 @@ impl<
 
 	#[cfg(feature = "runtime-benchmarks")]
 	fn successful_origin() -> O {
-		O::from(RawOrigin::Member(Default::default()))
+		let zero_account_id =
+			AccountId::decode(&mut sp_runtime::traits::TrailingZeroInput::zeroes())
+				.expect("infinite length input; no invalid inputs for type; qed");
+		O::from(RawOrigin::Member(zero_account_id))
 	}
 }
 

substrate/primitives/core/src/crypto.rs

@@ -478,9 +478,7 @@ pub trait Public: ByteArray + Derive + CryptoType + PartialEq + Eq + Clone + Sen
 }
 
 /// An opaque 32-byte cryptographic identifier.
-#[derive(
-	Clone, Eq, PartialEq, Ord, PartialOrd, Default, Encode, Decode, MaxEncodedLen, TypeInfo,
-)]
+#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Encode, Decode, MaxEncodedLen, TypeInfo)]
 #[cfg_attr(feature = "std", derive(Hash))]
 pub struct AccountId32([u8; 32]);
 
@@ -541,9 +539,9 @@ impl<'a> sp_std::convert::TryFrom<&'a [u8]> for AccountId32 {
 	type Error = ();
 	fn try_from(x: &'a [u8]) -> Result<AccountId32, ()> {
 		if x.len() == 32 {
-			let mut r = AccountId32::default();
-			r.0.copy_from_slice(x);
-			Ok(r)
+			let mut data = [0; 32];
+			data.copy_from_slice(x);
+			Ok(AccountId32(data))
 		} else {
 			Err(())
 		}