lsp: fix extract code action

Author: bhcleek

autoload/go/lsp.vim

@@ -1689,7 +1689,7 @@ function! go#lsp#Extract(line1, line2) abort
   let l:lsp = s:lspfactory.get()
 
   let l:state = s:newHandlerState('')
-  let l:handler = go#promise#New(function('s:handleCodeAction', ['refactor.extract', 'apply_fix', ''], l:state), 10000, '')
+  let l:handler = go#promise#New(function('s:handleCodeAction', ['refactor.extract.function', 'apply_fix', 'extract_function'], l:state), 10000, '')
   let l:state.handleResult = l:handler.wrapper
   let l:state.error = l:handler.wrapper
   let l:state.handleError = function('s:handleCodeActionError', [l:fname], l:state)