fix the specs errors due to a change to the min topic title's length (PR #421)

fixes #419

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Awesome this was on my list today to fix first thing :fish:

@eviltrout anytime :wink:

Just found out that I could only have changed this line to

client_setting(:min_topic_title_length, Rails.env.test? ? 5 : 15)

that actually feels a touch more messy, prefer not to have magic .test? settings in our site setting file, makes it hard to keep track of stuff