MDL-57220 boost: minimal fix for radio button template

It still does not match
http://v4-alpha.getbootstrap.com/components/forms/#radios
but I don't want to make radical changes before 3.2 release.

theme/boost/templates/core_form/element-radio-inline.mustache

@@ -10,7 +10,7 @@
    }
 
 }}
-<label class="form-check-inline {{#error}}has-danger{{/error}} fitem {{#advanced}}advanced{{/advanced}} {{{element.extraclasses}}}">
+<label class="form-check-inline form-check-label {{#error}}has-danger{{/error}} fitem {{#advanced}}advanced{{/advanced}} {{{element.extraclasses}}}">
 {{^element.hardfrozen}}{{#element.frozen}}{{#element.checked}}
     <input type="hidden" name="{{element.name}}" value="{{element.value}}">
 {{/element.checked}}{{/element.frozen}}{{/element.hardfrozen}}

theme/boost/templates/core_form/element-radio.mustache

@@ -19,7 +19,7 @@
         {{/text}}
     </div>
     <div class="col-md-9 checkbox">
-        <label>
+        <label class="form-check-label">
         {{^element.hardfrozen}}{{#element.frozen}}{{#element.checked}}
             <input type="hidden" name="{{element.name}}" value="{{element.value}}">
         {{/element.checked}}{{/element.frozen}}{{/element.hardfrozen}}