Remove loop by default from audio summary.

[svpcoder]

Easier when there are multiple audio samples on a summary page that is user is listening to.

More discussion at:
#296

cc @rryan

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[svpcoder]

I signed it.

[googlebot]

CLAs look good, thanks!

[rryan]

LGTM, thanks!

[chihuahua]

Makes sense! And one could right-click any audio element and enable looping for it anyway.