Fix  Wrong colour shown when GouraudTriangleShFill uses a DeviceN colorspace

Bug #89182
diff --git a/poppler/SplashOutputDev.cc b/poppler/SplashOutputDev.cc
index 6640ab5..2e2ec33 100644
--- a/poppler/SplashOutputDev.cc
+++ b/poppler/SplashOutputDev.cc
@@ -4364,7 +4364,7 @@
 #if SPLASH_CMYK
     case splashModeCMYK8:
     case splashModeDeviceN8:
-      bDirectColorTranslation = (shadingMode == csDeviceCMYK || shadingMode == csDeviceN);
+      bDirectColorTranslation = (shadingMode == csDeviceCMYK);
     break;
 #endif
     default: