NitroImg v1.5.1 - Responsive Images Restored

Converted images get their responsive srcset back, so browsers are offered the right size again instead of one file for every screen.

Responsive images

• Srcset restored on converted images - every image rendered by a theme or plugin template, including featured images, was being served as a single WebP file with no srcset. WordPress only builds a srcset when the image address matches a file it knows about, and after conversion the address said WebP while the record still named the JPEG or PNG. The smaller and larger versions WordPress had already generated were never offered: phones downloaded the same file as desktops, and Retina screens never received a 2x candidate. Fixed at the source, for every way an image can be rendered.
• Nothing to redo - already-converted libraries pick this up on update. No reconversion, no credits.