Move modal out of dropdown markup, ensure index matches slug

[yeraydiazdiaz]

Fixes #3152 again 😅

The issue was the id attribute in the slug deriving from an empty index variable which made all modals have the same id.

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• Release files

[lgh2]

I tested this on Linux Mint 18.1 (Ubuntu 16.04) with Chrome (Version 65.0.3325.124 (Official Build) beta (64-bit)) and it worked, the modal remained on the screen when I moused away from it.
It worked in Firefox 58.0.2 (64-bit) on the same OS.

It also works on Safari on an iPhone.