Adjust category tabs desktop layout to 50/50 split

[CySSoO]

Motivation

• Ensure the category-tabs block renders the image slider at 50% width on desktop and the next two products occupy the remaining 50% as requested, while keeping mobile behavior unchanged.

Description

• Updated Bootstrap grid classes in the category tabs template so the slider column uses col-lg-6 instead of col-lg-4 and the adjacent product column uses col-lg-6 instead of col-lg-8.
• Harmonized the conditional/fallback branches that applied slider-aware widths to also use col-lg-6 for desktop.
• Changes made in views/templates/hook/prettyblocks/prettyblock_category_tabs.tpl and only touch template grid classes (no CSS files were modified).

Testing

• Verified the template diff with git diff to confirm only the intended class replacements occurred and the working tree shows the modified file (succeeded).
• Searched the template with rg to confirm updated col-lg-6 occurrences (succeeded).
• Attempted an automated visual check via Playwright to capture a screenshot, but the container had no local webserver accessible at http://127.0.0.1:8080 so the page capture failed with ERR_EMPTY_RESPONSE (failed).

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Codex Task