microphone plugin: fix markup
microphone plugin: fix markup

ale-grosselle/wavesurfer.js,agamemnus/wavesurfer.js,agamemnus/wavesurfer.js,ffxsam/wavesurfer.js,ffxsam/wavesurfer.js,katspaugh/wavesurfer.js,katspaugh/wavesurfer.js,ale-grosselle/wavesurfer.js