import-script: Upload problemset by default if it exists.

There is no reason why you wouldn't want to make the full problem text
available.

This is in line with other questions, so that you typically just have to
press Enter for the default option after doing an initial import.

misc-tools/import-contest.in

@@ -126,7 +126,7 @@ def import_contest_problemset_document(cid: str):
             break
 
     if text_file:
-        if dj_utils.confirm(f'Import {text_file} for contest?', False):
+        if dj_utils.confirm(f'Import {text_file} for contest?', True):
             dj_utils.upload_file(f'contests/{cid}/problemset', 'problemset', text_file)
             print('Contest problemset imported.')
         else: