fix warning in Kton testcase

frame/balances/kton/src/mock.rs

@@ -27,11 +27,6 @@ pub type System = system::Module<Test>;
 pub type Ring = ring::Module<Test>;
 pub type Kton = Module<Test>;
 
-pub const NANO: Balance = 1;
-pub const MICRO: Balance = 1_000 * NANO;
-pub const MILLI: Balance = 1_000 * MICRO;
-pub const COIN: Balance = 1_000 * MILLI;
-
 impl_outer_origin! {
 	pub enum Origin for Test {}
 }
@@ -136,6 +131,7 @@ impl Default for ExtBuilder {
 	}
 }
 impl ExtBuilder {
+	#[allow(dead_code)]
 	pub fn existential_deposit(mut self, existential_deposit: Balance) -> Self {
 		self.existential_deposit = existential_deposit;
 		self
@@ -145,10 +141,12 @@ impl ExtBuilder {
 		self.transfer_fee = transfer_fee;
 		self
 	}
+	#[allow(dead_code)]
 	pub fn creation_fee(mut self, creation_fee: Balance) -> Self {
 		self.creation_fee = creation_fee;
 		self
 	}
+	#[allow(dead_code)]
 	pub fn monied(mut self, monied: bool) -> Self {
 		self.monied = monied;
 		if self.existential_deposit == 0 {