fix problem with positClass

Author: yurii-abdulaiev

dist/angular-toastr.js

@@ -242,6 +242,9 @@
           open: $q.defer()
         };
         newToast.iconClass = map.iconClass;
+        if (map.optionsOverride.positionClass) {
+            options.positionClass = map.optionsOverride.positionClass;
+        }
         if (map.optionsOverride) {
           angular.extend(options, cleanOptionsOverride(map.optionsOverride));
           newToast.iconClass = map.optionsOverride.iconClass || newToast.iconClass;