Fix wrong number of suggestions displayed sometimes

[slim]

When you set the limit: param to number of suggestions and the results from ajax are less than limit: the number of suggestions displayed was actually - .
This is a shift by one bug.

It's a one line fix. I did not compile and include dist files in the fix to keep fix clear.

[vigorouscoding]

This is a duplicate of the PR (#1566) I created a while back.
I don't mean to be rude and I appreciate your work very much but we should probably have only one PR around.
In my PR there is already some activity and someone kindly created a test case to reproduce the bug easily.

[tangopium]

If I look at the number of PR and Issues, the slow response of the authors seems to me the bigger problem here.

[jlbooker]

Duplicate of #1212

Check out this fork, where we've fixed this issue: https://github.com/corejavascript/typeahead.js

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