YJIT: small fix to stats formatting. #10197

Job	Run time
make (check, cppflags=-DVM_CHECK_MODE)	8m 23s
make (check, i686)	10m 21s
make (check, --disable-yjit)	6m 59s
make (check, --enable-shared --enable-load-relative)	7m 15s
make (test-bundler-parallel, 50)	27m 39s
make (test-bundled-gems)	17m 40s
make (check, ubuntu-20.04)	9m 17s
make (check, ubuntu-24.04)	10m 22s
Ubuntu result	1s
	1h 37m 57s

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