css(): minor tweaks to navbar and timepicker margins/paddings

public/less/navbar.less

@@ -39,7 +39,6 @@
   a {
     color: darken(@linkColor, 5%);
     background-color: @navbarButtonBackground;
-    border-bottom: 1px solid @navbarButtonBackground;
     display: inline-block;
     &:hover {
       background: @navbarButtonBackgroundHighlight;

public/less/sidemenu.less

@@ -40,7 +40,7 @@
   .top-nav-menu-btn {
     a {
       background-color: @sideMenuBackground;
-      padding-right: 47px;
+      padding-right: 46px;
       padding-left: 24px;
     }
     .icon-gf-grafana_wordmark  {

public/less/timepicker.less

@@ -7,7 +7,7 @@
 }
 
 .gf-timepicker-dropdown {
-  margin: 0px 0 15px 0;
+  margin: -5px -10px;
   padding: 10px 20px;
   float: right;
   background-color: @grafanaPanelBackground;