silence mode of curl (#6898)

Uses silence mode of curl for better autocomplete.
Co-authored-by: Dominik Rimpf <dev@d-rimpf.de>

plugins/gitignore/gitignore.plugin.zsh

 function gi() { curl -fL https://www.gitignore.io/api/${(j:,:)@} }
 
 _gitignoreio_get_command_list() {
-  curl -fL https://www.gitignore.io/api/list | tr "," "\n"
+  curl -sfL https://www.gitignore.io/api/list | tr "," "\n"
 }
 
 _gitignoreio () {