gtk3: it's the *Original* device we care about, not the temp clip hack devices

Change-Id: I2ac61cd2a99da25122165af692154fdbc2ac6d2e

vcl/headless/svpgdi.cxx

@@ -1154,7 +1154,7 @@ bool SvpSalGraphics::supportsOperation(OutDevSupportType eType) const
 {
     if (m_aDrawMode == basebmp::DrawMode::XOR)
         return false;
-    if (!isCairoCompatible(m_aDevice))
+    if (!isCairoCompatible(m_aOrigDevice))
         return false;
     switch (eType)
     {