Fix (create mutations for uncovered classes): adjust regex to ignore classnames which are prefixed with a classname to create mutations for#22

CaptainRedbeard24 wants to merge 2 commits intopestphp:4.xpestphp/pest-plugin-mutate:4.xfrom

CaptainRedbeard24:fix/class-to-mutate-detectionCaptainRedbeard24/pest-plugin-mutate:fix/class-to-mutate-detectionCopy head branch name to clipboard