patch 8.2.2827: test file was not deleted

Problem:    Test file was not deleted.
Solution:   Uncomment the delete() call. (Dominique Pellé, closes #8172)
diff --git a/src/testdir/test_mksession.vim b/src/testdir/test_mksession.vim
index e876f98..66e6e29 100644
--- a/src/testdir/test_mksession.vim
+++ b/src/testdir/test_mksession.vim
@@ -187,9 +187,9 @@
   mksession! Xtest_mks_zero
   set winminheight&
   let text = readfile('Xtest_mks_zero')->join()
-  "call delete('Xtest_mks_zero')
+  call delete('Xtest_mks_zero')
   close
-  " check there is no devide by zero
+  " check there is no divide by zero
   call assert_notmatch('/ 0[^0-9]', text)
 endfunc