fix calculation for finalPage in repo-search component

[jannaahs]

The finalPage was calculated incorrectly in the repo-search component. This caused an empty unnecessary page to be added as described in #15601.

OLD

this.finalPage = Math.floor(count / this.searchLimit) + 1;

This calculation will round down the number of pages and increment.

Math.floor(31/15) + 1 = 3
Math.floor(30/15) + 1 = 3
Math.floor(29/15) + 1 = 2

NEW

this.finalPage = Math.ceil(count / this.searchLimit);

This calculation will always round up the number of pages, if it's not an integer

Math.ceil(31/15) = 3
Math.ceil(30/15) = 2
Math.ceil(29/15) = 2

This pull request will fix #15601.

[6543]

rebased ... let's see if it pass now?

[6543]

@techknowlogick do a force merge? since same diff passed at #16382 ?

[6543]

merged as 57ee06f

@jannaahs thanks for the pull & I have no idear why your's did fail all the time but unrelated to the patch!