File I/O: Fix empty username after deleting saves #813

Job	Run time
ubuntu-latest g++ all	32s
ubuntu-latest g++ release	40s
ubuntu-latest clang++ all	40s
ubuntu-latest clang++ release	40s
ubuntu-latest cmake Debug	29s
ubuntu-latest cosmoc++ all	1m 15s
ubuntu-latest cosmoc++ release	1m 46s
windows-latest cl Debug	1m 55s
windows-latest g++ all	1m 33s
windows-latest g++ release	55s
windows-latest clang++ all	2m 34s
windows-latest clang++ release	2m 52s
windows-latest cmake Debug	1m 47s
macos-12 g++ all	44s
macos-12 g++ release	50s
macos-12 clang++ all	44s
macos-12 clang++ release	47s
macos-12 cmake Debug	41s
macos-latest g++ all	49s
macos-latest g++ release	51s
macos-latest clang++ all	47s
macos-latest clang++ release	1m 9s
macos-latest cmake Debug	41s
clang-format	3s
CodeQL Analysis (c-cpp)	2m 29s
	28m 13s

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