Expose tracks as a constant. (#12273)

* Expose tracks as a constant.

* Formatting

substrate/bin/node/runtime/src/lib.rs

@@ -828,6 +828,7 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
 		}
 	}
 }
+pallet_referenda::impl_tracksinfo_get!(TracksInfo, Balance, BlockNumber);
 
 impl pallet_referenda::Config for Runtime {
 	type WeightInfo = pallet_referenda::weights::SubstrateWeight<Self>;