Fix the installer checkbox so that is saves false as well as true

Author: Jeavon

src/UmbracoFileSystemProviders.Azure.Installer/Configurator/Views/checkbox.htm

@@ -1,5 +1,6 @@
 <input class="input-block-level"
 	   dynamic-name="param.Key"
 	   type="checkbox"
-	   ng-checked="param.Value"
-	   >
+	   ng-model="param.Value"
+	   ng-true-value="true"
+	   ng-false-value="false">