Fix pagination Next button visible when all data fits on one page

[clcl777]

Description

Fixes an issue where the "Next" pagination button was incorrectly visible when all data fits on a single page in DataTable reports (e.g., Behaviour > Pages).

Problem

When the total number of rows is less than or equal to the page limit, the Next button should be hidden since there is no next page. However, the button remained visible and clickable.
Additionally, clicking the Next button in this state caused incorrect pagination values to be displayed (e.g., showing "0–124 of 124" or "-1–124 of 124").

Root cause

When filter_limit is -1 (show all rows), the condition offsetEnd < totalRows was evaluated as:

• offsetEnd = filter_offset + filter_limit = 0 + (-1) = -1
• -1 < totalRows is always true when there is any data

Fix

Added a check for filter_limit > 0 to ensure the Next button is only shown when there's
actually a next page to navigate to.

Checklist

• [✔] I have understood, reviewed, and tested all AI outputs before use
• [✔] All AI instructions respect security, IP, and privacy rules

Review

• Functional review done
• Potential edge cases thought about (behaviour of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• New documentation added or existing documentation updated

[github-actions]

If you don't want this PR to be closed automatically in 28 days then you need to assign the label 'Do not close'.