Remove redundant code from Bank::wrap_with_bank_forks_for_tests()

[steviez]

Problem

The same initialization occurs when the Bank is inserted into a new BankForks, so no need to duplicate the logic in this test function

Summary of Changes

Remove redundant code; below is the snippet where this same thing happens in BankForks::new_from_banks():

solana/runtime/src/bank_forks.rs

Lines 211 to 216 in 2a67fa8

	for bank in bank_forks.read().unwrap().banks.values() {
	bank.loaded_programs_cache
	.write()
	.unwrap()
	.set_fork_graph(bank_forks.clone());
	}

[codecov]

Codecov Report

Merging #34448 (6612481) into master (2dfcdce) will increase coverage by 0.0%.
Report is 3 commits behind head on master.
The diff coverage is 100.0%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34448   +/-   ##
=======================================
  Coverage    81.8%    81.8%           
=======================================
  Files         819      819           
  Lines      220923   220921    -2     
=======================================
+ Hits       180870   180905   +35     
+ Misses      40053    40016   -37