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/pezframe/staking-async/ah-client/src/lib.rs

@@ -794,10 +794,12 @@ pub mod pezpallet {
 					// delegate to the fallback implementation.
 					T::Fallback::on_offence(offenders, slash_fraction, slash_session)
 				},
-				OperatingMode::Buffered =>
-					Self::on_offence_buffered(offenders, slash_fraction, slash_session),
-				OperatingMode::Active =>
-					Self::on_offence_active(offenders, slash_fraction, slash_session),
+				OperatingMode::Buffered => {
+					Self::on_offence_buffered(offenders, slash_fraction, slash_session)
+				},
+				OperatingMode::Active => {
+					Self::on_offence_active(offenders, slash_fraction, slash_session)
+				},
 			}
 		}
 	}