This is because your buttons are in a button group, and by default bootstrap expects more than one button.
You must either remove the button group or change the css to round the button, if there is only one.
In any case, to answer your question, the simplest way is through jquery:
$('.btn-group').removeClass('btn-group');
http://jsfiddle.net/uVffe/
Although you might want to add a class again so that I:
$('.btn-group').addClass('btn-group-single');
CSS
.btn-group-single > .btn:first-child { border-top-right-radius: 4px; border-bottom-right-radius: 4px; }
Then you can delete it in the future:
$('.btn-group').removeClass('btn-group-single');
http://jsfiddle.net/uVffe/1/
Switch Example:
http://jsfiddle.net/uVffe/3/
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