Adjust example for SFML 3 #452

Job	Run time
clang-format	6s
Windows MSVC Shared Release	2m 5s
Windows MSVC Shared Debug	2m 11s
Windows MSVC Static Release	3m 16s
Windows MSVC Static Debug	2m 39s
Windows ClangCL Shared Release	2m 35s
Windows ClangCL Shared Debug	2m 58s
Windows ClangCL Static Release	4m 40s
Windows ClangCL Static Debug	4m 11s
Windows Clang Shared Release	1m 58s
Windows Clang Shared Debug	2m 16s
Windows Clang Static Release	2m 32s
Windows Clang Static Debug	2m 14s
Linux GCC Shared Release	45s
Linux GCC Shared Debug	52s
Linux GCC Static Release	1m 19s
Linux GCC Static Debug	58s
Linux Clang Shared Release	56s
Linux Clang Shared Debug	45s
Linux Clang Static Release	1m 20s
Linux Clang Static Debug	1m 17s
macOS Clang Shared Release	1m 36s
macOS Clang Shared Debug	49s
macOS Clang Static Release	1m 14s
macOS Clang Static Debug	1m 10s
	46m 42s

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