community: fix error in sambastudio embeddings (#26260)

fix error in samba studio embeddings  result unpacking

libs/community/langchain_community/embeddings/sambanova.py

@@ -213,7 +213,7 @@ class SambaStudioEmbeddings(BaseModel, Embeddings):
                     )
                 try:
                     if params.get("select_expert"):
-                        embedding = response.json()["predictions"][0]
+                        embedding = response.json()["predictions"]
                     else:
                         embedding = response.json()["predictions"]
                     embeddings.extend(embedding)
@@ -299,7 +299,7 @@ class SambaStudioEmbeddings(BaseModel, Embeddings):
                 )
             try:
                 if params.get("select_expert"):
-                    embedding = response.json()["predictions"][0][0]
+                    embedding = response.json()["predictions"][0]
                 else:
                     embedding = response.json()["predictions"][0]
             except KeyError: