refactor: clean up `LedgerEntry.cpp` #4286

Job	Run time
dependencies (linux, gcc, Debug)	3m 21s
dependencies (linux, gcc, Release)	2m 15s
dependencies (linux, clang, Debug)	2m 47s
dependencies (linux, clang, Release)	2m 17s
conan	2m 50s
test (linux, gcc, Debug)	11m 25s
coverage (linux, gcc, Debug)	13m 11s
test (linux, gcc, Debug, -Dunity=ON)	8m 16s
test (linux, gcc, Release)	12m 13s
test (linux, gcc, Release, -Dunity=ON)	8m 5s
test (linux, clang, Debug)	9m 29s
test (linux, clang, Debug, -Dunity=ON)	6m 32s
test (linux, clang, Release)	11m 6s
test (linux, clang, Release, -Dunity=ON)	8m 13s
	1h 42m 0s

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