Remove old feature: simple_capitalization (bp #15763) (#15814)

* Remove old feature: simple_capitalization (#15763)

* Remove old feature: simple_capitalization

* Fix another failing test in core

* Finish up test cleanup

* Further clean up a bit

(cherry picked from commit 4bbeb9c033)

# Conflicts:
#	runtime/src/accounts_db.rs
#	runtime/src/bank.rs

* Fix conflicts

Co-authored-by: Ryo Onodera <ryoqun@gmail.com>

sdk/src/genesis_config.rs

@@ -149,11 +149,6 @@ impl GenesisConfig {
         hash(&serialized)
     }
 
-    pub fn disable_cap_altering_features_for_preciseness(&mut self) {
-        self.accounts
-            .remove(&crate::feature_set::simple_capitalization::id());
-    }
-
     fn genesis_filename(ledger_path: &Path) -> PathBuf {
         Path::new(ledger_path).join("genesis.bin")
     }