Only show nick completion button on mobile UI

directives/input.html

@@ -3,7 +3,7 @@
     <textarea id="{{inputId}}" class="form-control favorite-font" ng-trim="false" rows="1" ng-change="inputChanged()" autocomplete="on" ng-model="command" ng-focus="hideSidebar()">
     </textarea>
     <span class="input-group-btn">
-      <button class="btn btn-complete-nick unselectable" title="Complete nick" ng-click="handleCompleteNickButton($event)"><i class="glyphicon glyphicon-chevron-right"></i></button>
+      <button class="btn btn-complete-nick unselectable" title="Complete nick" ng-hide="hideCompleteNickButton()" ng-click="handleCompleteNickButton($event)"><i class="glyphicon glyphicon-chevron-right"></i></button>
       <label class="btn btn-send-image unselectable" for="imgur-upload" title="Send image">
         <i class="glyphicon glyphicon-picture"></i>
         <input type="file" accept="image/*" multiple title="Send image" id="imgur-upload" class="imgur-upload" file-change="uploadImage($event, files)">

js/inputbar.js

@@ -14,7 +14,7 @@ weechat.directive('inputBar', function() {
             command: '=command'
         },
 
-        controller: ['$rootScope', '$scope', '$element', '$log', 'connection', 'imgur', 'models', 'IrcUtils', 'settings', function($rootScope,
+        controller: ['$rootScope', '$scope', '$element', '$log', 'connection', 'imgur', 'models', 'IrcUtils', 'settings', 'utils', function($rootScope,
                              $scope,
                              $element, //XXX do we need this? don't seem to be using it
                              $log,
@@ -22,7 +22,8 @@ weechat.directive('inputBar', function() {
                              imgur,
                              models,
                              IrcUtils,
-                             settings) {
+                             settings,
+                             utils) {
 
             // E.g. Turn :smile: into the unicode equivalent
             $scope.inputChanged = function() {
@@ -503,6 +504,10 @@ weechat.directive('inputBar', function() {
                 $scope.completeNick();
                 return true;
             };
+
+            $scope.hideCompleteNickButton = function() {
+                return !utils.isMobileUi();
+            };
         }]
     };
 });