clippy: runtime lints

[brooksprumo]

Problem

There are new nightly clippy lints in the runtime crate. Refer to #34626 for more information.

warning: in a `match` scrutinee, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let`
   --> runtime/src/accounts/mod.rs:483:82
    |
483 |       let min_balance = match get_system_account_kind(payer_account).ok_or_else(|| {
    |  __________________________________________________________________________________^
484 | |         error_counters.invalid_account_for_fee += 1;
485 | |         TransactionError::InvalidAccountForFee
486 | |     })? {
    | |_____^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_conditions
    = note: `#[warn(clippy::blocks_in_conditions)]` on by default

warning: this `let...else` may be rewritten with the `?` operator
    --> runtime/src/bank.rs:3093:21
     |
3093 | /                     let Some(vote_account) = get_vote_account(&vote_pubkey) else {
3094 | |                         return None;
3095 | |                     };
     | |______________________^ help: replace it with: `let vote_account = get_vote_account(&vote_pubkey)?;`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#question_mark
     = note: `#[warn(clippy::question_mark)]` on by default

warning: this `let...else` may be rewritten with the `?` operator
    --> runtime/src/bank.rs:4778:17
     |
4778 | /                 let Some((_, account)) = accounts.get(i) else {
4779 | |                     return None;
4780 | |                 };
     | |__________________^ help: replace it with: `let (_, account) = accounts.get(i)?;`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#question_mark

    Checking solana-bench-streamer v1.18.0 (/Users/brooks/src/solana/bench-streamer)
warning: `solana-runtime` (lib) generated 3 warnings

Summary of Changes

Fix 'em.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (09a94b8) 81.8% compared to head (523d122) 81.8%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34630   +/-   ##
=======================================
  Coverage    81.8%    81.8%           
=======================================
  Files         824      824           
  Lines      222260   222256    -4     
=======================================
+ Hits       181893   181894    +1     
+ Misses      40367    40362    -5     

[HaoranYi]

lgtm