Fix typo in download-ggml-model.sh

Introduced in ggml-org#2589

Author: mrienstra

models/download-ggml-model.sh

@@ -49,7 +49,7 @@ medium-q8_0
 large-v1
 large-v2
 large-v2-q5_0
-large-v2-8_0
+large-v2-q8_0
 large-v3
 large-v3-q5_0
 large-v3-turbo