Change location of Rotation Lock in System Tray

The rotation lock tray was in an incorrect position within the system tray. This change moves it to be above the Settings item.

TEST=Have a device in maximize mode, open the system tray.
BUG=443654

Review URL: https://codereview.chromium.org/813353004

Cr-Commit-Position: refs/heads/master@{#310168}

ash/system/tray/system_tray.cc

@@ -192,9 +192,9 @@ void SystemTray::CreateItems(SystemTrayDelegate* delegate) {
   AddTrayItem(new TrayAudioChromeOs(this));
   AddTrayItem(new TrayBrightness(this));
   AddTrayItem(new TrayCapsLock(this));
+  AddTrayItem(new TrayRotationLock(this));
   AddTrayItem(new TraySettings(this));
   AddTrayItem(new TrayUpdate(this));
-  AddTrayItem(new TrayRotationLock(this));
   AddTrayItem(tray_date_);
 #elif defined(OS_WIN)
   AddTrayItem(tray_accessibility_);