patch 8.0.0699: checksum tests are not actually run

Problem:    Checksum tests are not actually run.
Solution:   Add the tests to the list. (Dominique Pelle, closes #1819)
diff --git a/src/testdir/test_alot_utf8.vim b/src/testdir/test_alot_utf8.vim
index 13724cb..8c9cfd2 100644
--- a/src/testdir/test_alot_utf8.vim
+++ b/src/testdir/test_alot_utf8.vim
@@ -12,3 +12,4 @@
 source test_regexp_utf8.vim
 source test_source_utf8.vim
 source test_utf8.vim
+source test_utf8_comparisons.vim