remove unnecessary imports

src/blocktree_processor.rs

@@ -254,7 +254,6 @@ mod tests {
     use crate::blocktree::tests::entries_to_blobs;
     use crate::entry::{create_ticks, next_entry, Entry};
     use solana_sdk::genesis_block::GenesisBlock;
-    use solana_sdk::native_program::ProgramError;
     use solana_sdk::signature::{Keypair, KeypairUtil};
     use solana_sdk::system_transaction::SystemTransaction;