Hide matching pattern if algorithm is auto

[shamoon]

This PR fixes #164 as discussed in #212 (comment) , it hides the pattern field if algorithm is set to "auto"

@jonaswinkler One thing I noticed is that its hard to tell what the default is, in the list of tags/correspondents under 'Matching' it just shows - and when you edit one of those the menu option is "Any", but is it actually ( / should it be) "Auto"? LMK, obviously I can sort it out if its just kind of a UI quirk

Edit: I see in Django admin default is "Any", so perhaps Angular UI should show same?

[jonaswinkler]

The matching algorithms don't do anything when the match is empty. That's why it shows up as "-" in the list. Except for Auto, which is always active.

I'd like to have an explicit matching algorithm field value for disabling matching eventually.

"Any" should be default.

"Auto" should NOT be default, since this doesn't work for all kinds of tags.

Also: "Case insensitive" does not apply to auto matching as well, please hide that!

[shamoon]

Oh I didn’t realize much of that. Yea might be worth thinking about how to clarify.

I’ll fix the checkbox soon, sorry I didn’t notice that

[shamoon]

Ok, checkbox hidden, should be all set