Don't use the robocopy error level.

rpavlik · rpavlik · commit f4d3c4447669 · 2015-06-30T22:56:07.000-05:00
diff --git a/install-managed-osvr.cmd b/install-managed-osvr.cmd
@@ -1,3 +1,6 @@
 cd /d "%~dp0"
 
 robocopy Managed-OSVR-Unity OSVR-Unity\Assets\Plugins /E
+
+exit /b 0
+
