Fix trailing whitespace issue with newlines.

Prevents browsers from converting trailing newlines to spaces when using
the selectedList option and the native select lacks closing option tags.
Without this change it looks like extra spaces are added.

Author: SteveTheTechie

src/jquery.multiselect.js

@@ -549,7 +549,8 @@
           value = selectedText.call(self, numChecked, inputCount, $checked.get());
         }
         else if (/\d/.test(selectedList) && selectedList > 0 && numChecked <= selectedList) {
-          value = $checked.map(function() { return $(this).next().text() }).get().join(options.selectedListSeparator);
+          value = $checked.map(function() { return $(this).next().text().replace(/\n$/, '') })
+                          .get().join(options.selectedListSeparator);
         }
         else {
           value = selectedText.replace('#', numChecked).replace('#', inputCount);