Fixing a spelling mistake in add_tags.feature

Change-Id: Ib0a8121e2186e7cbe49a2dc41bf2cfebc4286bcb
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

test/behat/features/artefact/collections/add_tags.feature

-@javascript @core @core_contentsy
+@javascript @core @core_content
 Feature: Adding tags and Verifying them
    In order to add a tag
    As an admin I need to be able to go Content