patch 8.2.4058: Vim9: import test failure in wrong line

Problem:    Vim9: import test failure in wrong line.
Solution:   Adjust line number.
diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index fd18f44..395265b 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -332,7 +332,7 @@
     defcompile
   END
   writefile(import_missing_name_lines, 'Ximport.vim')
-  assert_fails('source Ximport.vim', 'E1259:', '', 3)
+  assert_fails('source Ximport.vim', 'E1259:', '', 1)
 
   var import_assign_wrong_type_lines =<< trim END
     vim9script