[3.9] Fix navigating to the first page in pagination when SEF is off

[csthomas]

Pull Request for Issue #22983

Summary of Changes

Reverted a few lines added in the previous PR #19467
Changed the unit test method JPaginationTest::buildLink($url) to better emulate Router::build($url), where empty parameters such as &limitstart= are always removed from the URL.

Testing Instructions

Test #22983 when SEF is ON and OFF.

Expected result

You can back to the first page in pagination when SEF is OFF.

Actual result

When SEF is OFF the limitstart parameter remains in the link to the first page and you can not back to the first page.

Documentation Changes Required

No

[hendrikbehncke]

Test successful on 3f30b88

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[Quy]

I have tested this item ✅ successfully on 3f30b88

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/23042.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/23042.}