message: Remove fix_msg argument from Instantiate2
diff: @@ -164,6 +164,7 @@ pub enum WasmMsg {
  ///
  /// This is translated to a [MsgInstantiateContract2](https://github.com/CosmWasm/wasmd/blob/v0.29.2/proto/cosmwasm/wasm/v1/tx.proto#L73-L96).
  /// `sender` is automatically filled with the current contract's address.
  + /// `fix_msg` is automatically set to false.
  #[cfg(feature = "cosmwasm_1_2")]
  Instantiate2 {
  admin: Option<String>,
  @@ -175,7 +176,6 @@ pub enum WasmMsg {
  msg: Binary,
  funds: Vec<Coin>,
  salt: Binary,
  - fix_msg: bool,
  },
  /// Migrates a given contracts to use new wasm code. Passes a MigrateMsg to allow us to
  /// customize behavior.
  