fix(select): use $viewValue instead of $modelValue

Closes angular#8929

Conflicts:
	src/ng/directive/select.js

Author: shahata

src/ng/directive/select.js

@@ -541,6 +541,7 @@ var selectDirective = ['$compile', '$parse', function($compile,   $parse) {
                 selectedSet,
                 multiple);
             selectedSet = selectedSet || selected;
+
             label = displayFn(scope, locals); // what will be seen by the user
 
             // doing displayFn(scope, locals) || '' overwrites zero values