Fix manifest.f4m generator

Change attribute "bootstrapinfoId" in "media" node to "bootstrapInfoId", because OSMF 2.0 doesn't accept "bootstrapinfoId"

Demo
Bad: http://osmf.org/dev/2.0gm/StrobeMediaPlayback.html?src=https://s3.amazonaws.com/hds_test/bunny_hds/manifest_bad.f4m
Good: http://osmf.org/dev/2.0gm/StrobeMediaPlayback.html?src=https://s3.amazonaws.com/hds_test/bunny_hds/manifest_good.f4m