Fix additionalTextEdits being ignored

Regression was introduced in 6f4fdc7.
The logic was still fine if the LSP server delayed the
additionalTextEdits field, but if we already got it, we ended up
ignoring it.

Fix this by checking for additionalTextEdits outside the delayed-resolve
condition.

Also see yegappan#389

Author: vimpostor

autoload/lsp/completion.vim

@@ -591,9 +591,9 @@ def LspCompleteDone(bnr: number)
     # additional text edits.  So try to resolve the completion item now to get
     # the text edits.
     completionData = lspserver.resolveCompletion(completionData, true)
-    if !completionData->get('additionalTextEdits', {})->empty()
-      textedit.ApplyTextEdits(bnr, completionData.additionalTextEdits)
-    endif
+  endif
+  if !completionData->get('additionalTextEdits', {})->empty()
+    textedit.ApplyTextEdits(bnr, completionData.additionalTextEdits)
   endif
 
   if completionData->has_key('command')