MDL-56800 theme_boost: Clean up rendering of the radio buttons

The <input type="radio"> element does not support the size attribute so
there is no point of rendering it. Also fixed the example data as the
field name must not contain any whitespace.

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

@@ -4,16 +4,15 @@
    Example context (json):
    {
     "element": {
-        "id": "test-radio",
-        "name": "Test radio button",
-        "size": "10"
+        "id": "id_test_radio0",
+        "name": "test_radio_button"
       }
    }
 
 }}
 <label class="form-check-inline {{#error}}has-danger{{/error}} fitem {{#advanced}}advanced{{/advanced}} {{{element.extraclasses}}}">
 <input type="radio" name="{{element.name}}"
-    id="{{element.id}}" value="{{element.value}}" size="{{element.size}}"
+    id="{{element.id}}" value="{{element.value}}"
     {{#element.checked}}checked{{/element.checked}}
     {{#element.frozen}}disabled{{/element.frozen}}
     {{#error}}

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

@@ -4,9 +4,8 @@
     Example context (json):
     {
         "element": {
-            "id": "test-radio",
-            "name": "Test radio button",
-            "size": "10"
+            "id": "id_test_radio0",
+            "name": "test_radio_button"
         }
     }
 
@@ -15,7 +14,7 @@
     <div class="col-md-9 push-md-3 checkbox">
         <label>
         <input type="radio" name="{{element.name}}"
-            id="{{element.id}}" value="{{element.value}}" size="{{element.size}}"
+            id="{{element.id}}" value="{{element.value}}"
             {{#element.checked}}checked{{/element.checked}}
             {{#element.frozen}}disabled{{/element.frozen}}
             {{#error}}