fix(input): add 'type="button"' to button tag

Add attribute 'type="button"' to button tag. The missing attribute
caused forms with ion-toggle/ion-radio to not be submitted as a normal
form.

ionic/components/radio/radio-button.ts

@@ -36,6 +36,7 @@ import {RadioGroup} from './radio-group';
       '<div class="radio-inner"></div>' +
     '</div>' +
     '<button role="radio" ' +
+            'type="button" ' +
             '[id]="id" ' +
             '[attr.aria-checked]="_checked" ' +
             '[attr.aria-labelledby]="_labelId" ' +

ionic/components/toggle/toggle.ts

@@ -57,6 +57,7 @@ const TOGGLE_VALUE_ACCESSOR = new Provider(
       '<div class="toggle-inner"></div>' +
     '</div>' +
     '<button role="checkbox" ' +
+            'type="button" ' +
             '[id]="id" ' +
             '[attr.aria-checked]="_checked" ' +
             '[attr.aria-labelledby]="_labelId" ' +