Tag edit form cleanup

[Bakual]

Issue

The tag edit view currently shows the "images" tab twice.

This PR

While trying to fix the doubled tab, I suprisingly stumbled over a few other funny things in that form. So I fixed those as well. This PR now

• Removes the doubled "images" tab, leaving it to the JLayout to render it.
• Removes a workaround for the "urls" columng in the #__tags table. The underlying issue has been fixed with PostgreSQL - SQL error when add new tag #6314. The column isn't used anywhere and could most likely be removed from the database. I just leave it there for B/C reasons.
• Removes a JHtml::addIncludePath() call since the added path doesn't even exist.
• Removes $params "shortcut". We're not using params anywhere in the layout.

Testing

Make sure you can create and edit tags.

[jwaisner]

@test

PR works as intended. Able to create and edit tags.

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[zero-24]

Tested successful. What was changed that produces this issue? I have just see a component that has similiar issues on staging but no issues on 3.4.3 which is a B/C break ;)

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[Kubik-Rubik]

Thank you @Bakual! Merged.