[Wasm] Fix path to file_packager tool from EMSDK in GenerateHTML5Exam… #850

Job	Run time
build_linux (Full, Shared, Release)	3m 42s
build_linux (Full, Shared, Debug)	3m 25s
build_linux (Full, Static, Release)	3m 42s
build_linux (Full, Static, Debug)	3m 46s
build_linux (Limited, Shared, Release)	2m 50s
build_linux (Limited, Shared, Debug)	2m 37s
build_linux (Limited, Static, Release)	2m 53s
build_linux (Limited, Static, Debug)	2m 53s
	25m 48s

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