add database to list of features in issue template

Adds the `database` input to the list of existing features in the issue template for feature requests.

Author: 2bndy5

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -11,6 +11,7 @@ body:
       multiple: true
       options:
         - version
+        - database
         - thread-comments
         - tidy-checks
         - style