Update the compatMode in the right place
Update the compatMode in the right place

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branch : svgmathml

html5lib/html5lib-python,mgilson/html5lib-python,gsnedders/html5lib-python,alex/html5lib-python,ordbogen/html5lib-python,ordbogen/html5lib-python,dstufft/html5lib-python,mindw/html5lib-python,ordbogen/html5lib-python,mgilson/html5lib-python,html5lib/html5lib-python,alex/html5lib-python,mindw/html5lib-python,gsnedders/html5lib-python,mgilson/html5lib-python,dstufft/html5lib-python,html5lib/html5lib-python,mindw/html5lib-python,alex/html5lib-python,dstufft/html5lib-python