No longer truncates arguments in sidekiq-web, instead uses overflow: scroll to let you see them

Given the ease of this change, consider this the issue per Contributing.md.

The truncation of arguments at 100 characters in sidekiq-web makes it basically unusable for the scheduled jobs for me since our job classes are namespaced into modules and Moped::BSON::ObjectIds serialize themselves starting with `!ruby/object:Moped::BSON::ObjectId` which is more than 1/3 of the allotted space anyway.

As such, this just limits the height of the table row and adds an overflow:scroll so I can see what's going on.