Update .hgignore to ignore SQLite3 databases for parallel testing (#35030).

git-svn-id: http://svn.redmine.org/redmine/trunk@20930 e93f8b46-1217-0410-a6f0-8f06a7374b81

.hgignore

@@ -16,6 +16,7 @@ config/initializers/secret_token.rb
 coverage
 db/*.db
 db/*.sqlite3
+db/*.sqlite3-*
 db/schema.rb
 files/*
 lib/redmine/scm/adapters/mercurial/redminehelper.pyc