fix var name

Author: maltesa

lib/cohere/client.rb

@@ -59,7 +59,7 @@ def embed(
       response = connection.post("embed") do |req|
         req.body = {texts: texts}
         req.body[:model] = model if model
-        req.body[:input_type] = model if input_type
+        req.body[:input_type] = input_type if input_type
         req.body[:truncate] = truncate if truncate
       end
       response.body