tdf#104139 keep the current OpenGL state

This hopefully fixes tdf#104139, which I cannot reproduce on my system.

Change-Id: I903f479a1f401804481b9645c9377c4aaeec13f7
(cherry picked from commit 83288089d5efd2cd1d5c76b05a4ba3f782641e88)
Signed-off-by: David Tardon <dtardon@redhat.com>
diff --git a/vcl/inc/opengl/RenderState.hxx b/vcl/inc/opengl/RenderState.hxx
index 1f526ba..25dd837 100644
--- a/vcl/inc/opengl/RenderState.hxx
+++ b/vcl/inc/opengl/RenderState.hxx
@@ -22,8 +22,6 @@ protected:
    GenericCapabilityState()
        : mbTest(readState())
    {
        if (mbTest)
            disable();
    }

    static bool readState()