CStdGL: Ignore any SetDeviceGammaRamp errors on Windows

On some devices this function fails without any apparent reason and
returns nonsensical error values that we can't handle. As the log
message is very annoying and the function is part of the fallback
code path for screen gamma, just ignore any errors and don't log them.

src/StdGLCtx.cpp

@@ -225,10 +225,7 @@ bool CStdGL::SaveDefaultGammaRampToMonitor(CStdWindow *pWindow)
 bool CStdGL::ApplyGammaRampToMonitor(CGammaControl &ramp, bool fForce)
 {
 	if (!MainCtx.hDC || (!Active && !fForce)) return false;
-	if (!SetDeviceGammaRamp(MainCtx.hDC, ramp.red))
-	{
-		logger->error("Error setting gamma ramp: {:02x}", ::GetLastError());
-	}
+	SetDeviceGammaRamp(MainCtx.hDC, ramp.red);
 	return true;
 }