style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

bizinikiwi/client/consensus/beefy/src/communication/gossip.rs

@@ -150,12 +150,13 @@ impl<B: Block, AuthorityId: AuthorityIdBound> Filter<B, AuthorityId> {
 				f.start = cfg.start;
 				f.end = cfg.end;
 			},
-			_ =>
+			_ => {
 				self.inner = Some(FilterInner {
 					start: cfg.start,
 					end: cfg.end,
 					validator_set: cfg.validator_set.clone(),
-				}),
+				})
+			},
 		}
 	}