feat(typeahead): move inline style to stylesheet

- Move inline style to stylesheet

Closes #5219

Author: wesleycho

src/typeahead/typeahead.css

@@ -0,0 +1,3 @@
+[uib-typeahead-popup] .dropdown-menu {
+  display: block;
+}

template/typeahead/typeahead-popup.html

@@ -1,4 +1,4 @@
-<ul class="dropdown-menu" ng-show="isOpen() && !moveInProgress" ng-style="{top: position().top+'px', left: position().left+'px'}" style="display: block;" role="listbox" aria-hidden="{{!isOpen()}}">
+<ul class="dropdown-menu" ng-show="isOpen() && !moveInProgress" ng-style="{top: position().top+'px', left: position().left+'px'}" role="listbox" aria-hidden="{{!isOpen()}}">
     <li ng-repeat="match in matches track by $index" ng-class="{active: isActive($index) }" ng-mouseenter="selectActive($index)" ng-click="selectMatch($index, $event)" role="option" id="{{::match.id}}">
         <div uib-typeahead-match index="$index" match="match" query="query" template-url="templateUrl"></div>
     </li>