Reformat imports to a consistent style for imports

rustfmt.toml configuration:
        imports_granularity = "One"
         group_imports = "One"

sdk/program/src/system_instruction.rs

@@ -1,13 +1,15 @@
-use crate::{
-    decode_error::DecodeError,
-    instruction::{AccountMeta, Instruction, InstructionError},
-    nonce,
-    pubkey::Pubkey,
-    system_program,
-    sysvar::{recent_blockhashes, rent},
+use {
+    crate::{
+        decode_error::DecodeError,
+        instruction::{AccountMeta, Instruction, InstructionError},
+        nonce,
+        pubkey::Pubkey,
+        system_program,
+        sysvar::{recent_blockhashes, rent},
+    },
+    num_derive::{FromPrimitive, ToPrimitive},
+    thiserror::Error,
 };
-use num_derive::{FromPrimitive, ToPrimitive};
-use thiserror::Error;
 
 #[derive(Error, Debug, Serialize, Clone, PartialEq, FromPrimitive, ToPrimitive)]
 pub enum SystemError {
@@ -567,9 +569,11 @@ pub fn authorize_nonce_account(
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-    use crate::instruction::{Instruction, InstructionError};
-    use num_traits::ToPrimitive;
+    use {
+        super::*,
+        crate::instruction::{Instruction, InstructionError},
+        num_traits::ToPrimitive,
+    };
 
     fn get_keys(instruction: &Instruction) -> Vec<Pubkey> {
         instruction.accounts.iter().map(|x| x.pubkey).collect()