patch 8.1.0335: mkview test fails on CI

Problem:    mkview test fails on CI.
Solution:   Attempt to force recomputing curswant after folding.
diff --git a/src/testdir/test_mksession.vim b/src/testdir/test_mksession.vim
index ed8b10f..426afac 100644
--- a/src/testdir/test_mksession.vim
+++ b/src/testdir/test_mksession.vim
@@ -320,7 +320,7 @@
   " Create a view with line number and a fold.
   help :mkview
   set number
-  norm! V}zf
+  norm! V}zf0
   let pos = getcurpos()
   let linefoldclosed1 = foldclosed('.')
   mkview! Xview