fix(ngOptions): fix frozen ui in ie with more than one select[multiple]

If there are more than one select, and the first select is wrappend
in an element with display: inline or display: inline-block, all but
the last select are completely unresponsive to any user input.

This cannot be tested in a unit-test, as the events must come directly
from the ui.

Close #11314

Author: Narretz

src/ng/directive/ngOptions.js

@@ -535,7 +535,6 @@ var ngOptionsDirective = ['$compile', '$parse', function($compile, $parse) {
         element.disabled = option.disabled;
         if (option.value !== element.value) element.value = option.selectValue;
         if (option.label !== element.label) {
-          element.label = option.label;
           element.textContent = option.label;
         }
       }