Fix navbar + menu flashing

Author: silverwind

templates/base/head_navbar.tmpl

@@ -104,7 +104,7 @@
 					<span class="not-mobile">{{svg "octicon-triangle-down"}}</span>
 					<span class="only-mobile">{{ctx.Locale.Tr "create_new"}}</span>
 				</span>
-				<div class="menu left">
+				<div class="menu">
 					<a class="item" href="{{AppSubUrl}}/repo/create">
 						{{svg "octicon-plus"}} {{ctx.Locale.Tr "new_repo"}}
 					</a>

web_src/css/modules/header.css

@@ -135,7 +135,8 @@ h4.ui.header .sub.header {
 }
 
 /* open dropdown menus to the left in right-attached headers */
-.ui.attached.header > .ui.right .ui.dropdown .menu {
+.ui.attached.header > .ui.right .ui.dropdown .menu,
+.navbar-right .ui.dropdown .menu {
   right: 0;
   left: auto;
 }