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

pezkuwi/runtime/teyrchains/src/inclusion/tests.rs

@@ -151,8 +151,8 @@ pub(crate) fn back_candidate(
 		|i| Some(validators[group[i].0 as usize].public().into()),
 	)
 	.ok()
-	.unwrap_or(0) >=
-		threshold;
+	.unwrap_or(0)
+		>= threshold;
 
 	match kind {
 		BackingKind::Unanimous | BackingKind::Threshold => assert!(successfully_backed),
@@ -207,8 +207,8 @@ pub(crate) fn run_to_block(
 }
 
 pub(crate) fn expected_bits() -> usize {
-	paras::Teyrchains::<Test>::get().len() +
-		configuration::ActiveConfig::<Test>::get().scheduler_params.num_cores as usize
+	paras::Teyrchains::<Test>::get().len()
+		+ configuration::ActiveConfig::<Test>::get().scheduler_params.num_cores as usize
 }
 
 fn default_bitfield() -> AvailabilityBitfield {